About 20 minutes ago we started seeing a pronounced increase in the number of errors generated on the site. We’re investigating the cause of this problem.
Update (2:15p): This has now been resolved.
Some users are seeing an incomplete number of tweets when viewing their @username mentions (the replies tab on twitter). In particular, older tweets may be missing and users may find that they cannot page back to see older @username mentions. We’re working to fix the problem that causes this.
We’re starting a limited test of notifications on twitter.com for when you have new tweets. So if one of the folks you follow has tweeted since you loaded your homepage, you’ll get a little notice saying “1 new tweet” that, when clicked, will display the new content.
We think it improves the tweet consumption experience and hope to roll it out to everyone as soon as we can.