Certainly not the first. I remembered there's Loopt acquiring GraffitiGeo but I'm sure there's more: http://techcrunch.com/2009/10/20/mobile-social-network-wars

Certainly not the first. I remembered there's Loopt acquiring GraffitiGeo but I'm sure there's more: http://techcrunch.com/2009/10/20/mobile-social-network-wars-loopt-acquires-graffitigeo/ http://techcrunch.com/2009/10/20/mobile-social-network-wars-...