plentoffish.com is very huge and what is most important - it's 100% free but i heard that Plenty of Fish is where all the liars, scammers etc hang out. I don't know why but i said what i heard. But it's still one of the best dating websites on the internet, and you don't have to pay any single buck for membership. Most members come from North America so if you are from other part of world then you wouldn't find a lot of users from your area.