1. Get a sucker to create a free profile and provide e-mails of people they know.
2. Send annoying e-mails to those people to try to get them to create profiles.
3. See how many suckers will subscribe to some nonsense premium service for a couple of bucks, then make it a hassle to unsubscribe.
4. Have the list of members available to provide to sales spammers.
5. Then there is TalentSolutions. You will find more talent standing in line at Walmart than you will here.