I'd like to gather user data in a web-based intranet application similar to rapportive, gist and xobni. These services gather and display facebook profiles, twitter streams, linkedin profiles, etc. based on the user's email address in your inbox.
Is there a 3rd party library or API (free or paid) that would provide this kind of data from social networks based on a person's email address? I'd rather not have to go through and create calls for all these different services, not to mention maintaining all these APIs. If there is already a service out there that does the work of search and aggregation that would be so useful.
The application is in C#, so a C# library or wrapper for the API would be nice but definitely not a requirement.