Zoosk is possibly the most popular dating application on Facebook. This app allows you to search for Zoosk members near you, sending the ones you fancy flirts, messages and friend requests. The application turned full online dating service has even inspired a song -- see: "Zoosk Girl" by Flo Rida and T-Pain. www.facebook.com/Zoosk
Are you Interested?
Are You Interested? has a simple premise. Browse through Are You Interested? users and click "Yes (Anonymous)," "Yes (Let them know)" or "Skip" the user if your not interested. Unfortunately, that's as far as you can go for free. Sign up for paid service on areyouinterested.com to send users messages or add them as friends. www.facebook.com/AreYouInterested
allows you to search for someone you find attractive and even chat with him on Facebook. You're able to send your potential guy messages and flirts. However, you cannot add him as a friend or send him gifts via Facebook. You'll have to sign up at speeddate.com for that. www.facebok.com/speeddate
This is a multi-lingual social networking website, managed out of a Soho, London headquarters, but owned by a company in Cyprus and ultimately by Russian entrepreneur Andrey Andreev. Although available in most of the world, the site is most active in Latin America, Spain and Italy, as well as France. Badoo ranks as the 52nd most popular site in France and the 150th globally, according to Alexa Internet.
In a peer-reviewed study, it was given the lowest score for privacy among 45 social networking sites examined. Source;