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Re:Twitter Hits 50 Million Tweets Per Day and GROWING. by justinhj on Monday February 22, 2010 @05:23PM (#1143918)
Except the post explicitly mentions that spams are removed.
Re:Twitter Hits 50 Million Tweets Per Day and GROWING. by axod on Monday February 22, 2010 @05:27PM (#1143926)
"Please note that tweets from accounts identified as spam have been removed so the counts in this chart do not include spam."

Yeah call me crazy, but I expect there's a large amount of spam, bots, auto reposters, etc included in there.

It's hardly a trivial thing to identify and remove spam. Especially where your data is limited to 140 characters.

The other question would be are retweets included in the total.