There are two new social networks, Sonar launched in May and Banjo this morning, which may offer the digital agency a new and inventive way to market for clients. Instead of marking friends and then telling you where those people are, these networks treat locations as the friend and then tell you whom else is nearby. Sonar will also flag the other nearby people by how many FaceBook friends you have in common. Both are available for the iPhone, but only Banjo is currently available for Android.

AllThingsD.com
The verdict is still out on these location friending networks. Effective mobile application development means increasing the apps base usage, so others join up and continue to check in. The other problem plaguing these apps is their counter-intuitiveness. For a brick-and-mortar storefront to appear it would need to be logged into the app and only then would someone else logged in, who also happened to be nearby, see the storefront. Among early adopters, however, that might be precisely why these apps can drive some traffic. If they do take off in popularity then there might be too many nearby contacts to attract much attention, but in the nascent stages it might work very well, especially since the account is free. Digital agency’s using these networks for advertising and social media marketing should wait until there is some growth.
Read Write Web: New Wave of Social Networks Have You “Friending” Your Location










