A few facts about Twitter (none longer than a tweet)

Twitter was founded in San Francisco in 2006. The company went public in November 2013.

The company’s stock is down 63.5 percent over the past year, mainly because of concerns about the service’s ability to grow its audience.

Twitter said it had 305 million monthly active users in the fourth quarter of 2015 — down 2 million from the previous quarter.

In 2013, the company acquired three Boston-area startups: Bluefin Labs, Crashlytics, and Spindle.

Twitter says its Kendall Square office houses the largest group of software developers outside of its San Francisco headquarters.

Twitter cofounder Jack Dorsey returned to the CEO’s chair last October; he also runs the digital payments company Square.

SCOTT KIRSNER