diff --git a/assets.yml b/assets.yml
index 625dd382fa..bdd8de091d 100644
--- a/assets.yml
+++ b/assets.yml
@@ -53,6 +53,7 @@ javascripts:
         - media/js/vendor/jquery.tinysort.js
         - media/js/vendor/jquery.fieldselection.js
         - media/js/vendor/jquery.tipsy.js
+        - media/js/vendor/jquery.autosize.js
         - media/js/vendor/jquery.chosen.js
         - media/js/vendor/jquery.effects.core.js
         - media/js/vendor/jquery.effects.slideOffscreen.js
diff --git a/media/js/newsblur/views/story_share_view.js b/media/js/newsblur/views/story_share_view.js
index e5b357b070..6c3985cf21 100644
--- a/media/js/newsblur/views/story_share_view.js
+++ b/media/js/newsblur/views/story_share_view.js
@@ -7,6 +7,7 @@ NEWSBLUR.Views.StoryShareView = Backbone.View.extend({
         "click .NB-sideoption-share-crosspost-twitter"  : "toggle_twitter",
         "click .NB-sideoption-share-crosspost-facebook" : "toggle_facebook",
         "click .NB-sideoption-share-crosspost-appdotnet" : "toggle_appdotnet",
+        "keypress .NB-sideoption-share-comments"   : "autosize",
         "keyup .NB-sideoption-share-comments"   : "update_share_button_label",
         "keydown .NB-sideoption-share-comments" : "maybe_close"
     },
@@ -22,7 +23,7 @@ NEWSBLUR.Views.StoryShareView = Backbone.View.extend({
             social_services: NEWSBLUR.assets.social_services,
             profile: NEWSBLUR.assets.user_profile
         }));
-        
+
         return this;
     },
     
@@ -83,6 +84,7 @@ NEWSBLUR.Views.StoryShareView = Backbone.View.extend({
             $facebook_button.removeClass('NB-active');
             $appdotnet_button.removeClass('NB-active');
             this.update_share_button_label();
+            this.$('textarea').autosize();
 
             if (options.animate_scroll) {
                 var $scroll_container = NEWSBLUR.reader.$s.$story_titles;
@@ -145,7 +147,7 @@ NEWSBLUR.Views.StoryShareView = Backbone.View.extend({
         $share_wrapper.animate({
             'height': sideoption_content_height
         }, {
-            'duration': options.immediate ? 0 : 350,
+            'duration': options.immediate ? 0 : options.duration || 350,
             'easing': 'easeInOutQuint',
             'queue': false,
             'complete': _.bind(function() {
@@ -352,6 +354,10 @@ NEWSBLUR.Views.StoryShareView = Backbone.View.extend({
         NEWSBLUR.log(["post_share_error", data, shared, message, $share_button, $unshare_button, $share_button_menu, $error]);
     },
     
+    autosize: function() {
+        this.resize({duration: 100});
+    },
+    
     update_share_button_label: function() {
         var $share = this.$('.NB-sideoption-share');
         var $comment_input = this.$('.NB-sideoption-share-comments');
diff --git a/media/js/vendor/jquery.autosize.js b/media/js/vendor/jquery.autosize.js
new file mode 100755
index 0000000000..27b341b36e
--- /dev/null
+++ b/media/js/vendor/jquery.autosize.js
@@ -0,0 +1,272 @@
+/*!
+	Autosize v1.18.9 - 2014-05-27
+	Automatically adjust textarea height based on user input.
+	(c) 2014 Jack Moore - http://www.jacklmoore.com/autosize
+	license: http://www.opensource.org/licenses/mit-license.php
+*/
+(function ($) {
+	var
+	defaults = {
+		className: 'autosizejs',
+		id: 'autosizejs',
+		append: '\n',
+		callback: false,
+		resizeDelay: 10,
+		placeholder: true
+	},
+
+	// border:0 is unnecessary, but avoids a bug in Firefox on OSX
+	copy = '<textarea tabindex="-1" style="position:absolute; top:-999px; left:0; right:auto; bottom:auto; border:0; padding: 0; -moz-box-sizing:content-box; -webkit-box-sizing:content-box; box-sizing:content-box; word-wrap:break-word; height:0 !important; min-height:0 !important; overflow:hidden; transition:none; -webkit-transition:none; -moz-transition:none;"/>',
+
+	// line-height is conditionally included because IE7/IE8/old Opera do not return the correct value.
+	typographyStyles = [
+		'fontFamily',
+		'fontSize',
+		'fontWeight',
+		'fontStyle',
+		'letterSpacing',
+		'textTransform',
+		'wordSpacing',
+		'textIndent'
+	],
+
+	// to keep track which textarea is being mirrored when adjust() is called.
+	mirrored,
+
+	// the mirror element, which is used to calculate what size the mirrored element should be.
+	mirror = $(copy).data('autosize', true)[0];
+
+	// test that line-height can be accurately copied.
+	mirror.style.lineHeight = '99px';
+	if ($(mirror).css('lineHeight') === '99px') {
+		typographyStyles.push('lineHeight');
+	}
+	mirror.style.lineHeight = '';
+
+	$.fn.autosize = function (options) {
+		if (!this.length) {
+			return this;
+		}
+
+		options = $.extend({}, defaults, options || {});
+
+		if (mirror.parentNode !== document.body) {
+			$(document.body).append(mirror);
+		}
+
+		return this.each(function () {
+			var
+			ta = this,
+			$ta = $(ta),
+			maxHeight,
+			minHeight,
+			boxOffset = 0,
+			callback = $.isFunction(options.callback),
+			originalStyles = {
+				height: ta.style.height,
+				overflow: ta.style.overflow,
+				overflowY: ta.style.overflowY,
+				wordWrap: ta.style.wordWrap,
+				resize: ta.style.resize
+			},
+			timeout,
+			width = $ta.width(),
+			taResize = $ta.css('resize');
+
+			if ($ta.data('autosize')) {
+				// exit if autosize has already been applied, or if the textarea is the mirror element.
+				return;
+			}
+			$ta.data('autosize', true);
+
+			if ($ta.css('box-sizing') === 'border-box' || $ta.css('-moz-box-sizing') === 'border-box' || $ta.css('-webkit-box-sizing') === 'border-box'){
+				boxOffset = $ta.outerHeight() - $ta.height();
+			}
+
+			// IE8 and lower return 'auto', which parses to NaN, if no min-height is set.
+			minHeight = Math.max(parseInt($ta.css('minHeight'), 10) - boxOffset || 0, $ta.height());
+
+			$ta.css({
+				overflow: 'hidden',
+				overflowY: 'hidden',
+				wordWrap: 'break-word' // horizontal overflow is hidden, so break-word is necessary for handling words longer than the textarea width
+			});
+
+			if (taResize === 'vertical') {
+				$ta.css('resize','none');
+			} else if (taResize === 'both') {
+				$ta.css('resize', 'horizontal');
+			}
+
+			// The mirror width must exactly match the textarea width, so using getBoundingClientRect because it doesn't round the sub-pixel value.
+			// window.getComputedStyle, getBoundingClientRect returning a width are unsupported, but also unneeded in IE8 and lower.
+			function setWidth() {
+				var width;
+				var style = window.getComputedStyle ? window.getComputedStyle(ta, null) : false;
+				
+				if (style) {
+
+					width = ta.getBoundingClientRect().width;
+
+					if (width === 0 || typeof width !== 'number') {
+						width = parseInt(style.width,10);
+					}
+
+					$.each(['paddingLeft', 'paddingRight', 'borderLeftWidth', 'borderRightWidth'], function(i,val){
+						width -= parseInt(style[val],10);
+					});
+				} else {
+					width = $ta.width();
+				}
+
+				mirror.style.width = Math.max(width,0) + 'px';
+			}
+
+			function initMirror() {
+				var styles = {};
+
+				mirrored = ta;
+				mirror.className = options.className;
+				mirror.id = options.id;
+				maxHeight = parseInt($ta.css('maxHeight'), 10);
+
+				// mirror is a duplicate textarea located off-screen that
+				// is automatically updated to contain the same text as the
+				// original textarea.  mirror always has a height of 0.
+				// This gives a cross-browser supported way getting the actual
+				// height of the text, through the scrollTop property.
+				$.each(typographyStyles, function(i,val){
+					styles[val] = $ta.css(val);
+				});
+				
+				$(mirror).css(styles).attr('wrap', $ta.attr('wrap'));
+
+				setWidth();
+
+				// Chrome-specific fix:
+				// When the textarea y-overflow is hidden, Chrome doesn't reflow the text to account for the space
+				// made available by removing the scrollbar. This workaround triggers the reflow for Chrome.
+				if (window.chrome) {
+					var width = ta.style.width;
+					ta.style.width = '0px';
+					var ignore = ta.offsetWidth;
+					ta.style.width = width;
+				}
+			}
+
+			// Using mainly bare JS in this function because it is going
+			// to fire very often while typing, and needs to very efficient.
+			function adjust() {
+				var height, original;
+
+				if (mirrored !== ta) {
+					initMirror();
+				} else {
+					setWidth();
+				}
+
+				if (!ta.value && options.placeholder) {
+					// If the textarea is empty, copy the placeholder text into 
+					// the mirror control and use that for sizing so that we 
+					// don't end up with placeholder getting trimmed.
+					mirror.value = ($ta.attr("placeholder") || '') + options.append;
+				} else {
+					mirror.value = ta.value + options.append;
+				}
+
+				mirror.style.overflowY = ta.style.overflowY;
+				original = parseInt(ta.style.height,10);
+
+				// Setting scrollTop to zero is needed in IE8 and lower for the next step to be accurately applied
+				mirror.scrollTop = 0;
+
+				mirror.scrollTop = 9e4;
+
+				// Using scrollTop rather than scrollHeight because scrollHeight is non-standard and includes padding.
+				height = mirror.scrollTop;
+
+				if (maxHeight && height > maxHeight) {
+					ta.style.overflowY = 'scroll';
+					height = maxHeight;
+				} else {
+					ta.style.overflowY = 'hidden';
+					if (height < minHeight) {
+						height = minHeight;
+					}
+				}
+
+				height += boxOffset;
+
+				if (original !== height) {
+					ta.style.height = height + 'px';
+					if (callback) {
+						options.callback.call(ta,ta);
+					}
+				}
+			}
+
+			function resize () {
+				clearTimeout(timeout);
+				timeout = setTimeout(function(){
+					var newWidth = $ta.width();
+
+					if (newWidth !== width) {
+						width = newWidth;
+						adjust();
+					}
+				}, parseInt(options.resizeDelay,10));
+			}
+
+			if ('onpropertychange' in ta) {
+				if ('oninput' in ta) {
+					// Detects IE9.  IE9 does not fire onpropertychange or oninput for deletions,
+					// so binding to onkeyup to catch most of those occasions.  There is no way that I
+					// know of to detect something like 'cut' in IE9.
+					$ta.on('input.autosize keyup.autosize', adjust);
+				} else {
+					// IE7 / IE8
+					$ta.on('propertychange.autosize', function(){
+						if(event.propertyName === 'value'){
+							adjust();
+						}
+					});
+				}
+			} else {
+				// Modern Browsers
+				$ta.on('input.autosize', adjust);
+			}
+
+			// Set options.resizeDelay to false if using fixed-width textarea elements.
+			// Uses a timeout and width check to reduce the amount of times adjust needs to be called after window resize.
+
+			if (options.resizeDelay !== false) {
+				$(window).on('resize.autosize', resize);
+			}
+
+			// Event for manual triggering if needed.
+			// Should only be needed when the value of the textarea is changed through JavaScript rather than user input.
+			$ta.on('autosize.resize', adjust);
+
+			// Event for manual triggering that also forces the styles to update as well.
+			// Should only be needed if one of typography styles of the textarea change, and the textarea is already the target of the adjust method.
+			$ta.on('autosize.resizeIncludeStyle', function() {
+				mirrored = null;
+				adjust();
+			});
+
+			$ta.on('autosize.destroy', function(){
+				mirrored = null;
+				clearTimeout(timeout);
+				$(window).off('resize', resize);
+				$ta
+					.off('autosize')
+					.off('.autosize')
+					.css(originalStyles)
+					.removeData('autosize');
+			});
+
+			// Call adjust in case the textarea already contains text.
+			adjust();
+		});
+	};
+}(window.jQuery || window.$)); // jQuery or jQuery-like library, such as Zepto