Communications Major

The change could increase user numbers, and also help the company sell more visual ads.

Twitter dropped its long-awaited S-1 filing on the world today, a step toward becoming a public company. The filing, which gives statistics on Twitter's finances and users, is the first real look under the company's hood. It's a signal to investors about how the company makes money, how it stacks up to Facebook and other social networks when it comes to user engagement, and what it's worried about as it approaches the public markets.