In The Journey through Finding Online Dating Profits I've Ran into this useful Infograph that I wanted to share with my fellow Stackers:

Also Some other Interesting Facts (according to DatingSiteReviews.com) about 2012:
General Information
-The online dating industry has 40 million users and has $1.9 billion in annual revenue.
-81% of members of dating sites lie about their height, weight, or age in their profiles.
-The average couple who meets online waits 18.5 months to get married. Meeting offline the average couple waits 42 months.
United States
-The dating service industry in the United States is projected to be worth $2.1 billion.
-There is estimated to be 1,500 dating sites in the United States.
-The state of Illinois passes an internet dating safety bill requiring dating sites to state if they do not conduct background checks.
Australia
-About 25 percent of Australians have tried online dating with 16 percent reporting to have found a long-term relationship.
Canada
-STDs are on the rise. Chlamydia has increased 66 percent since 2000. Some health experts believe this corresponds to the rise of online dating.
Brazil
-Brazil has about 62 million singles. Every month 5.6 million of them vist online dating sites.
More Fascinating Stats can be found on:
http://www.datingsitesreviews.com/st...cts-statistics
Looking Forward to the Feedback.
Enjoy!
nice research..but it's more a branding point of view...collect you own data...and screw those studies!
studies are studies..only theoretical. try the contrary!
Here's another cool one:
http://mashable.com/2012/03/24/onlin...infographic-2/
Little tip for anyone who does seo, google intitle:infographic + "your KW". Infographics are great targets for your spammy URLs cause they typically get tons of natural links. Most of the time just comment about how they got the data and it'll get through moderation just fine 
If you're a pinterest spammer than infographics are great for reposting, too. The pinterest sheeple love them. 
Very interesting infographic... for some reason, I just always enjoy reading them.
eHarmony - 20 million members
+
Match - 15 million members
=/=
POF - 41 million members
What do you guys do about the bots / scammer / chatters on your platform to prevent them from taking advantage of people? Must be super hard.
i don't think the number of scammars are so low. other researches are really cool. all in all the US members are the main target. in practical the conversion also show th same result i think 
Yeah I agree with nusolutionz, collect your own data, it's the most reliable you can have.