For myself and almost everyone I know the mobile phone is the definitive buddy list, so this is an excellent idea.

Once you've gathered information about who people contact and how often what will you do with it?

Great idea, with one serious problem though. Xobni data are useful mostly to infer social relationships. You can get the data you need only for smartphones, which are small proportion of all phones. Social data are useful if you don't have big inherent holes in that social graph.

So you need to target smartphones and can't use the social network effect. But you can still add big value to the phone's owner.

make it web based and target all web enabled devices. At least that way your not going to limited by device memory.

just curious, but what makes you think xobni will not be offering the feature soon, and if they will what makes you think that yours will have an advantage to theirs, knowing they are already ahead, have users, and done a good job executing it and will probably offer the services faster than you can!!!

i still don't really get xobni :-\

What's up there. I have a mobile app that mines your phone and sends it to the server. it is up, and runnning and I have 1 corporate client. what is a good way to contact you?