We are currently researching a bug that has caused some Tweets to not be displayed. status.twitter.com/post/807182454…
Some users are currently experiencing problems accessing Twitter. We are aware of the issue and are working towards a resolution.
We encountered an issue where some users were unable to Tweet and received a locked out notice. This issue is now resolved.
Starting today, we're rolling out a new font on twitter.com, moving from Helvetica Neue to Gotham.