The Ticker: Gas prices; PRSA keynotes; Twitter buys Posterous; Social music; ‘Leanwashing’

Washington PostObama makes public appeal to consumers on gas prices

Press releaseTwitter Co-Founder Biz Stone and Pandora Founder Tim Westergren to Keynote the PRSA 2012 International Conference

AllTwitterTwitter Buys Posterous (So You’d Better Move Your Content To Tumblr ASAP)

Brandflakes for Breakfastsocial music in a nutshell

Press releaseGreenwashing Crusaders Now Tackling Bogus Food Marketing