No, the idea of matching riders to driver using a GPS enabled phone is at least as old as 2001: http://www.google.com/patents/US6697730

Zimride did indeed launch in 2007 as a Facebook based carpooling app. It wasn't real-time at that time. Don't know if/when Zimride built an iPhone app but I built a real-time ridesharing iPhone app in 2008: http://ridecell.com/gt/

Uber started in 2009.

Disclaimer: The company I started, InstantCab, competes directly with Uber.