Porting online dating to mobile devices has brought big changes to how such services work. Websites tend to expend a lot of effort on providing the best potential matches, based on things like common interests and similar desires. Many apps, on the other hand, tend to be more about speed and immediacy. Some of the most popular apps are geared toward finding and meeting people as quickly as possible, often based on not much more than photographs. That's true even of apps that don't explicitly emphasize "hookups." What follows are some of the most popular, or at least currently buzzworthy, mainstream-oriented dating apps.