Well, Dennis Crowley, CEO of Foursquare (a mobile check-in service), is on the venture circuit traveling to the Silicon Valley and Boston. Foursquare is poised to reach more than 1 milllion users faster than Twitter. With the recent news of tool designed to provide real-time data to businesses, Mark Zuckerberg beware.
What does this mean? It could potentially mean a valuation of $80-$100 million.
http://www.businessinsider.com/foursquare-dennis-crowley-2010-04