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.
OKCupid is one of the most popular dating sites and is free to sign up initially.
It works with special algorithms that match users with potential dates.
Millions of Brits turn to the web in search of a partner every year - but what's the true cost of finding love on the internet?
There are currently over 1,400 relationship-finder sites in Britain - all claiming to do one thing - find your match, and at that, fast.
And with so much choice, choosing on the right one for you can be a tough job, as can finding one to suit your budget - but how much should you spend on your quest for love?
Here are 10 of the biggest websites in the UK and how much they cost a month.
UK members: 3 million Top features: Advanced 'smart search' which allows you to filter matches by location and personality traits.
Price per month: £29.99 Website: members: 3 million Top features: Complete their free affinity questionnaire and you'll be matched with compatible and like-minded members.Price per month: £44.95 per month or £11.95 per month for a 12 month membership Website: members: 475,000 Top features: Personality profile based on the ''Big Five'' personality models - gender, age, residence, profession and level of education to help create long term relationships.Price per month: £79.95 a month or £19.95 a month when you subscribe for 12 months Website: UK members: 370,000 Top features: Lovestruck.com's behavioural recommendation engine assesses your search history, like page views, winks and favourites to help you find what you're actually looking for - and not what you say you're looking for.Price per month: £39 a month or £11.58 a month when you subscribe for 12 months Website: UK members: 200,000 Top features: They believe that your friends know you best - so, like a virtual wingman, they write your profile for you!Price per month: £28 Website: UK members: 10,000 Top features: 24/7 live chat support and super-high security.Inbuilt personalised location features, and weekly dating tips, to help you find that special someone.