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July 31, 2013 @ 12:45pm EDTReasons for Prediction
"I think facebook needs to make some privacy changes or another social network will offer one that people change to."
January 2012
July 09, 2011 @ 06:36pm EDT
"because its already passed"
January 2012
June 18, 2012 @ 04:47am EDT
"Several huge corporations moving to block: MS (Skype), Google."
never
May 13, 2011 @ 10:21am EDT
"Perhaps FB has passed the hype peak, and is now in a plateu of productivity."
never
May 27, 2011 @ 09:54am EDT
Background information
Facebook’s growth has been enormous. From a single-campus bit of social software it has grown to hundreds of millions of users, worldwide, becoming the world’s largest social network.
What next?
We’re picking the great round one billion figure as a milestone, a hook for our collective imaginations. The figure and its implications could well take our breath away… and yet, could it happen?
Facebook’s official timeline shows an impressive upward arc:
2008 December over 100 million active users
2009 January 150 million active users
2009 July 250 million active users
2009 September 300 million active users
2009 December 350 million active users
2010 February 400 million active users
2010 July 500 million active users
In 2009 this prediction market’s players accuratedly predicted one of these milestones. Let’s see how we do this time!
The idea comes from George Boretos on LinkedIn,
September 2011
Please don’t buy or sell this one, since it’s now in the past.
January 2012
Facebook will crack 1 billion around 1 January 2012.
never
Although Facebook’s growth has been vast, it’s going to reach an upper bound in the n hundreds of millions, then either plateau or decline.
After July 2013
Facebook reaches one billion users, but far down the road: late 2013 or beyond. (thanks to Joe Benfield and geoparadigm for the idea)

http://newsroom.fb.com/News/One-Billion-People-on-Facebook-1c9.aspx
Which answer was closest?
http://techcrunch.com/2012/04/23/facebooks-amended-s-1-500-million-mobile-users-paid-300m-cash-23-million-shares-for-instagram/
https://www.facebook.com/press/info.php?statistics
http://bit.ly/1113fb1b
A) The subject should read more precise referring to “active users” instead of “users”
B) September 11 is passed: Why is this answer still active/selectable ?
http://www.readwriteweb.com/archives/google_plus_traffic_went_up_1269_last_week.php
http://www.readwriteweb.com/archives/google_plus_traffic_drops_1269_gains_erased.php
And evidently FB is up to 800 million. Not that this is a two horse race or anything: just some new data points.
http://bit.ly/paNcAJ
“Americans spent a total of 53.5 billion minutes on Facebook in May, according to a new Nielsen study released Monday.
In fact, the media-measurement firm’s new report on social networking found that Americans spent more time on Facebook than on any other website – and it wasn’t even close. Yahoo was second with 17.2 billion minutes in May and Google ranked third at 12.5 billion minutes."
Sounds like the makings for a good markets question somewhere in there.
Also, what do you think the Google+ project impact will be on this market?
Google+ is aimed squarely at FB. If it succeeds, points to “never”, perhaps.
http://www.slate.com/id/2296932/
http://blogs.discovermagazine.com/gnxp/2011/05/facebook-finally-plateaus-in-2011/?utm_source=twitterfeed&utm_medium=twitter
But, seriously, think of it this way: Facebook’s growth curve could flatten out a bit. Still rising, just not as rapidly. Different demographics adopt more slowly, new arrivals are balanced by exits, etc.
Sorry – as you can tell, I’m a stickler for question clarity ;)