Fling.com isn't very complicated about its goals, and it's equally
simple to use. It's very popular but surprisingly offers extremely limited access before upgrading. You can see partial details and thumbnail photo for each profile, but nothing more until you pay. You can see the last login info for each member, at least, but you can't show interest in any free manner. Once you upgrade, you can send and receive instant messages, add people to a favorites list nicknamed "blackbook" as well as use video chat. The standard silver membership price is quite competitive. However, the gold membership offers contact with free subscribers even if it's priced more than most other sites.
