Find another source of this same content. Based on the licensing of it either: use it directly, quote and reference to it, approach the best contributors and o

Find another source of this same content. Based on the licensing of it either: use it directly, quote and reference to it, approach the best contributors and offer to pay peanuts for their content, approach the site and pay for a bulk license. Or just outright steal it and deal with the repercussions later :-O (It worked, albeit indirectly, for YouTube etc.) Or if you wish to go the normal route, add an incentive. Free "pro" accounts to the top contributors, ad-revenue share (with a minimum payout set to something sensible, like affiliate programs, so you only deal with the best contributors). Or something as simple as a points system (works well at somewhere like HN & StackOverflow).