Ping is a simple way to exchange information with people you meet - a digital business card if you will. However this is just the foundations for a personal CRM - a tool that will help you keep on top of and organise your network.
Addme is my social platform 'business card', it's awesome.
>we (More Than We) is a digital business card that makes it simple and effective to organise the people you meet. Add location, a note and groups to each new connection, whilst sharing one of multiple profiles and then getting reminders to follow up.