That's really a cool site, thanks! Contained lots of websites I didn't know about  .

A suggestion: You probably want the site to stay as simple as possible technically, and so you may not want to enable something like a wiki or forum. However, link sites often suffer from lack of updating after a time. As Patatas already suggested, there are sites/services that could be labeled as scams. Other sites may disappear.

I would thus suggest a feedback feature for every site. I've seen you've included a review feature where you can reward a site up to 5 "coins". Besides of that, you could enable a button "Site doesn't exist anymore" and another one to report scams, and a general feedback form.