"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

"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.