Join our special Saturday edition Tweetchat from 12:30 - 1:30 pm CST for a lively conversation and a chance to win a $20 gift certificate! We'll be tweeting live from SXSW. Use #SXSW and #bloggercred to participate. Topic: How do you measure blogger credibility? Featuring special guest FTC attorney Stacey Ferguson (@justiceFergie).