Facebook Foursquare Geotagging Mobile 
Convince & Convert
APRIL 7, 2010
Now, I’m not suggesting Foursquare will ever approach Twitter’s level of ubiquity, much less Facebook’s. Because Foursquare makes very little sense unless you’re in a physical location like a store, restaurant, etc. At least it is for me.
Convince & Convert
MARCH 16, 2010
Growth Is Slowing The true size of the Twitter audience is a bit tricky to pin down because 55% of its users do so via third party and mobile applications. According to these numbers, the audience using Twitter actually declined from August to December, 2009 (during the same period, Facebook went from 250 million to 350 million members).
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