iFive: Twitter’s Growth, YouTube Gets "Channels," iPad Delays RIM PlayBook, Apple Orders Huge Data Store, Facebook Phone Arrives

1. Darling of the social media scene Twitter just revealed some stats for its recent performance, and they’re pretty eye-popping: Over the first quarter of 2011 Twitter’s tweet-per-day count grew 41% globally, and 38% in the U.S. Meanwhile from December to March there was a 52% increase in monthly sign-ups, and 155 million tweets per day are going on, up from 55 million at the same time last year.