The tipping position for Twitter's reputation was the 2007 South by Southwest Interactive (SXSWi) conference. It had 400,000 tweets posted for every quarter in 2007. This grew to one hundred million tweets posted for every quarter in 2008. In February 2010, Twitter customers have been sending fifty million tweets for each day. Work on the venture started out on March 21, 2006, when Dorsey released the first Twitter concept at 12:50 p.m.