Just ran into a weird case on Twitter: If I tweet the following link to Failblog, the tweet disappears:
http://failblog.org/2012/02/23/epic-win-photos-win-wwf-win/
It disappears even if shortened with something like TinyURL. I noticed because a couple of people favourited my tweet before it disappeared, and then when it disappeared, Twitter's own "interactions" page became corrupted (one of their Javascript functions returned "undefined").
