The tipping level for Twitter's recognition was the 2007 South by Southwest Interactive (SXSWi) meeting. It experienced 400,000 tweets posted per quarter in 2007. This grew to one hundred million tweets posted for every quarter in 2008. In February 2010, Twitter end users were being sending 50 million tweets for each working day. Work on the job begun on March 21, 2006, when Dorsey published the to start with Twitter message at 12:50 p.m.