Online matchmaking is big business, no doubt. It draws from a huge demographic with 90 million singles in the U.S. alone between 19 and 45. Surprisingly, or not, 40% of frequent users are already married.

Want some more stats?  The site Statistic Brain(2) has a myriad of "who knew" statistics.  What we can draw from them is up for debate.  Here are a few:

17% percent of marriages in the last year the couples met online and 20% of current committed relationships began online.  (That's significant.)

Number of questions to fill in on eHarmony:  400.  (Really, 400?)

Percent of women who have sex on the first encounter:  33%.  (I'm praying this stat is skewed due to some sites being specifically for hookups.)  

I guess blonds still have more fun.  30% say it's at the top of their list of attraction.

38% of women prefer "nice guys" and 6% will take any they can get.  24% of men prefer the "hottie".

Ouch.  A woman's desirability peaks at 21.  [I'm just reporting.]

By age 48, men have twice as many pursuers as women.  (No doubt.)

OkCupid, launched in 2004, and is the most popular free online dating service with 7 million users.  

Coffee Meets Bagel has "gamified" the trend.  After filling out the requisite info, like religion, ethnicity, height, etc., at noon each day, you receive

For online profiles, statistics on average show that men overstate their income. This makes sense because on average women are attracted to men that make more money.  And wouldn't you know it, more data shows men are attracted to women who are prettier, leading to the stereotype that men care about looks and women care about money.  Some of the most frustrating comments from online users is the unreliability of the photos, age, income.  Especially the photos.