'Twitter hits 200M users' in 2011 —Brian Breslin

Created by gwern on 2010-12-29; known on 2012-01-01; judged right by PseudonymousUser on 2012-01-03.

• gwern estimated 60% on 2010-12-29
• gwern said “http://brianbreslin.com/2011-predictions/” on 2010-12-29
• kallman estimated 100% and said “They added 100M just last year, plus whatever they had before: http://blog.twitter.com/2010/12/stocking-stuffer.html” on 2010-12-30
• PseudonymousUser said “Wikipedia says 300M users” on 2012-01-03
• PseudonymousUser   judged this prediction right on 2012-01-03.
• gwern said “agreement http://brianbreslin.com/2011-predictions-recap/” on 2012-01-08