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During the second quarter of calendar 2013, Twitter had 150.9 billion Timeline Views, up 69 percent from the previous quarter.
Twitter defined Timeline Views as "as the total number of timelines requested when registered users visit Twitter, refresh a timeline or view search results while logged in on our website, mobile website or desktop or mobile applications."
There are a few caveats to that definition. For example, witter clarified that these figures exclude TweetDeck and the Twitter client for Mac because Twitter does "not fully track this data."