Each user is a set of tags
each user specifies the on the tags it sees fit
more informative and interesting than you have tags, the more people will want to talk with you
using tags, you can easily find desired and interesting people
without tags, you cannot offer to communicate to others
Your reputation solves everything
Reputation is a relative indicator of the adequacy and sociability of the interlocutor. Every time you touch with anyone you should give the interviewee a plus or a minus in reputation, depending on what showed your partner.
The greater your reputation, the higher your position in the tape who want to communicate and the more advantages and opportunities.
Also, you can leave a short feedback about each other that will appear in the history of reputation.