Here's a look at Twitter, by the numbers:

200 million monthly active users, out of 500 million registered users.

500 million tweets tweeted per day.

$582 million in revenue projected for this year by eMarketer.

$309 million in mobile advertising revenue for 2013, projected by eMarketer.

$7 million in profit for 2012, on sales of $245 million, as estimated by PrivCo.

1,240 employees at the end of 2012, estimated by PrivCo.

$10 billion market value based on last funding in May,

And 140 characters maximum per tweet, of course.

-- compiled by Mercury News staff writer Brandon Bailey