BuddyPress.org

If I had the time, I’d build a plug-in that 1. added a section to the profile page that 2. worked like myBlogLog in that it showed a bunch of username/profile url fields for the various other social networks and then validated prior to 3. showing on a member profile as a nice icon/button to that site/platform/service. Otherwise, odds are many noob users won’t go the extra mile to paste links or do whatever it takes to make text look right.