There are several sites that offer additional levels of security including background checks and photo verification.
These sites have the broadest appeal and generally the largest membership bases.
The app is available in over 80 countries and has over 27 million searchable members.
OKCupid is one of the most popular dating sites and is free to sign up initially.
It was originally a service called Just Say Hi, but the site transitioned to Mingle2 in 2008 and now works with many populations of singles.