Between Q2 and Q4, account ownerships grew from 408 million to 485 million. Active users increased from 208 million to 288 million in that period. According to internet market research firm GlobalWebIndex, that makes Twitter the fastest-growing social platform in that period.

Read more: http://www.businessinsider.com/infographic-breaking-down-twitter-data-2013-2#ixzz2M9JnBcBq

Wow! I had no idea they were growing so fast!

Even Amy Jellicoe has a Twitter account.  "But first let's begin with the week's greatest horror: Amy has discovered Twitter."

http://www.slate.com/articles/arts/tv_club/features/2013/enlightened_season_2_preview_laura_dern_dermot_mulroney_in_new_episodes/week_4/enlightened_recap_season_2_episode_4_follow_me_reviewed.html