Buddystream is a wordpress plugin for Buddypress that allows members to stream their wall posts and status messages from other social networks like Facebook, Google +, Twitter, YouTube, Last.fm, Soundcloud, Vimeo, Flickr, LinkedIn and RSS Feeds. Official Website: www.buddystream.com
This would still be a great profile tab. I'd pay for it's development. The profile tab could be called "Social Networks" and it would just show an aggregated feed of the social networks we have entered in our Contact Details.