Is most likely the same problem as aaronpk/IndieAuth.com#108
+1 having this issue
It looks like this is actually because Twitter is not sending an HTTP redirect for browser user agents. Instead they send an HTTP 200 response and an HTML redirect instead. We can probably easily fix this by not sending a browser-like user agent when fetching t.co URLs, or add support for handing HTML meta redirect responses as well.
I think that fetching takes place in the rel-me lib https://github.com/indieweb/rel-me
Also discussion reference: https://chat.indieweb.org/dev/2016-07-26#t1469574949249000
Closing since more context captured and soon to be resolved in #52.