I have studied your given detail regarding project, i have understood that you need an mobile application that provide user to chat with its closer, should have google integration,should have gprs integration,Gprs allow user to show another nearest user on that geographical area,
This app should have social network integration.
I hope all above description is following actual requirements if i am diverting any where please make me correct, with this description i also need some other information
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Thanks & Regard,
Vikky..