In their Website they are saying that,"Meetup believes that people can change their personal world, or the whole world, by organizing themselves into groups that are powerful enough to make a difference."
Their motto is Do something,Learn Something,Share Something, Change something!
Very good thinking.
Now lets have look in the popularity of this social networking site:(Report of 24/1/2012)
Rank in Alexa is 532. Estimated traffic is about 800,000 to 5,000,000 visitors/month.Look at the daily Traffic Rank Trend
|Daily Traffic Rank Trend|
The New York City Baby Boomers Meetup Group
Some other very popular groups in Meetup:
The Los Angeles Ruby/Rails Meetup Group (Los Angeles, CA) - Meetup
INTERNATIONALS in Paris (Paris) - Meetup
Meetup also maintain a HQ blog.You can find many information about them from this blog.
|Meetup Official HQ Blog|
Useful Social Media and Blogging Tips.