Ref: http://blog.foursquare.com/category/community/ 10m members
Ref: http://www.facebook.com/press/info.php?statistics 800m active members
Ref: http://en.wikipedia.org/wiki/Google_Latitude 10m users, 3m active
Very limited geographical roll-out. Ref: http://en.wikipedia.org/wiki/Google_Offers
Ref: Wikipedia. More than 50m monthly UV, 20m members and over 50m reviews.
ASA investigation launched. TripAdvisor replaced its tagline.
Most popular photo-sharing service on iOS.
Ref: http://en.wikipedia.org/wiki/Instagram 150m images from 20m users
Ref: http://en.wikipedia.org/wiki/Flickr 51 million registered members and 80 million unique visitors.
App isn’t preferred by hipsters.
250,000 downloads for an estimated 8m users
Ref: http://www.bloomberg.com/news/2011-12-27/google-may-have-400-million-users-by-end-of-next-year-statistician-says.html G+ has 62 million members, according to Bloomberg, and it's growing by 625,000 every single day.
Vibrant G+ photo community plus easy access to G+ photo albums.
National Academy of Science. Lewis, Gonzales, Kaufman, 2012. http://www.citeulike.org/user/tnhh/article/10150415
http://en.wikipedia.org/wiki/Social_capital
Portes, A. (1998). Social Capital: its origins and applications in modern sociology Annual Review of Sociology, 24, 1-24. Putnam, Robert. (2000), "Bowling Alone: The Collapse and Revival of American Community" (Simon and Schuster).