What you are looking at is 11,000 instances of "good morning" being tweeted in various languages over a 24 hour period. Notice the color black—these are the slackers that stumble out of bed past noon.
The tweets appear as blocks and are colour-coded. Green tweets are early in the morning, orange tweets are at about 9am, and red tweets are later in the morning. Black tweets are 'out-of-time' messages (sent at times that aren't in the morning at that location).