It's official: Twitter has surpassed 10 billion tweets. While Gigatweet's counter is down due to over-traffic, you can tell by the actual tweet ID numbers that we have crossed the magical threshold.
The milestone shows that Twitter's still growing at a rapid pace: It broke one billion tweets in November 2008 and five billion tweets just four months ago.
So who was the lucky person that sent out tweet 10 billionth tweet? We're checking now and will let you know ASAP.
Update: Tweet #10 billion apparently belongs to a protected user, as API calls won't allow us to see that specific status update. Via @timdorr, here is Tweet #9,999,999,999 and tweet #10,000,000,001.