Is it fair to list okcupid as a direct competitor? I think dating sites, with the social profile aspect, is almost fundamentally different than a personals ad.
I guess you could argue that is the case with airbnb, but I don't think the transaction type is more limited than the kinds that happen in relationships.
Random accents do help to make sure you're seeing proper encoding. The output of this site will look like junk if you encode it as UTF-8 and try to view it with any other encoding.
Try it and see. Copy the output and paste it into a text document and save as UTF-8. In chrome, open that document and, under the View menu, choose a different encoding.