Excellent. If you’re having problems replicating, it happens occasionally in the sidebar here whenever Twitter does not respond:
http://tpyatt.com/
I have the same problem.
The tags appear unescaped and outside of the translate function in jetpack/modules/widgets/twitter.php, so I can’t find what code is responsible for modifying the markup.
It seems also that set_transient() is used in this file, presumably to cache the response from Twitter and use the last cached response instead of an error message. Maybe there is a problem with the implementation of this?
