Twoo.com
Match.com
Match Group
IAC Inc.
LinkedIn
Viadeo
Bebo
Badoo
hi5
Plenty of Fish
Tagged (website)
Ask.fm
Friendster
French online dating service
meetic.com
Meetic is a French online dating service founded in November 2001. It is recognized for its intuitive interface and matching algorithms that suggest potential partners to users based on profile attributes. Wikipedia