ah, good old trend analysis
"The world's richest man made public a number of slides at the weekend included in his company talk, in which he claimed new user signups in the seven days to November 16 averaged 2 million per day, up 66 percent year-on-year. Further, he said Twitter had recorded 8 billion user active minutes per day for the seven days to November 15, up 30 percent."
...and it sounds like from there, he decided this means Twitter's on trend for a billion users in 18 months. Oh boy.
As someone pointed out elsewhere, this is a lot like the New York Stock Exchange in September 1929 saying "wow, look at all this activity on our trading floor! Things must be going great!"
...or the captain of the Titanic on April 15 proudly noting just how busy traffic seemed to be on the deck...