Curiously (well... actually it's not that strange since we are both back from BlogTalk) Ton Zijlstra is thinking about the same thing I have been thinking in the last couple of days: a tool to make social networking management easier across existing networks. Ton says:

Hence my question. Would there be a way to create a search agent that takes the name of a person you've met? Ideally you would provide such a search agent with your own account data of all the environments you are part of that you want to have searched. And then it comes back with a number of likely search results that might contain any or all of the following for instance:

Possible blogs of that person
Possible Flickr Feed, or 23 feed
Possible Skypename
Possible IM names
Profile in OpenBc.com
Profile in LinkedIn.com
Profile at 43people.com
Possible Plazes account
Possible del.icio.us account

So that I could have a look if it indeed is the person I am looking for, and then connect or subscribe. Connecting and subscribing would be manual again. Only I can send out personal messages, only I decide what to add to the feedreader.

Developing a tool which able to search all these sites should be possible, many services are already offering open API and some scraping might help with the ones which don't, the real issue is going to be matching profiles: for example somebody would have to confirm that this profile on LinkedIn belongs to the same person who owns this set of links on Del.icio.us.

Waiting for some type of federated ID system, this can easily be achieved manually and thinking about a centralized and social service, once the connection has been done by the first user, the same connection could be offered by the next user who queries the system.

This type of service fits pretty well in the PeopleAggregator vision, there already is the possibility to sync accounts from Flickr and Facebook within PA. There is already a ton of features on our roadmap, but stay tuned, a solution might not be that far away :-)