OkCupid, Plenty of Fish and Tinder are excellent online dating sites for young adults who are looking for love. Unlike some other dating services, all three are free to use.
OkCupid and Plenty of Fish are more traditional dating sites than Tinder. They require users to fill out a profile with detailed information about themselves and then use that to help create matches based on compatibility. OkCupid does this by having users answer a series of questions, whereas Plenty of Fish matches users based on the interests they provide.
Tinder is more straightforward with a focus on shorter relationships. It is available on mobile phones. Users look at a photo and read a short blurb about potential matches and then choose if they're interested or not. If both users decide they like each other, they are connected and able to chat.