Subtelegram is a sweet and simple chat bot for Telegram, it returns the URL for a Subreddit when it is mentioned in a groupchat. Very handy when you often refer to a Subreddit.
A live version is running at: @SubredditLookupBot
Note: Your message should be formated as
/r/subredditname because of privacy reasons a Telegram bot can only see command messages by default.