I think it would be cooler if this could be done programmatically.

Write a matchmaker system/app? that users could allow to process their data and find patterns (likes, comments) tying them to people they were interested in. This could then anonymously contact the matched individual and prompt them to run the app.

This would avoid some abuse issues and because each partner has no control over the matches made, makes the whole thing less awkward.

Might also include: - Textual analysis of comment text throughout a users 'graph'. - Privacy issues. - Business plan.