Twitter celebrated its 10th birthday on Monday.

Although the company has had its share of troubles — user growth has stalled and the company still isn't profitable — ten years is like a lifetime in tech. So the employees there had a lot to celebrate.

Here are some pictures Twitter sent along of the internal celebration.

SEE ALSO: 14 of Twitter's earliest employees: Where are they now?

Twitter cofounders Jack Dorsey (the current CEO), Biz Stone, and Ev Williams kick off the celebration.

Another shot of Stone, Dorsey, and Williams talking to employees.

Employees listen to recently hired Chief Marketing Officer Leslie Berland.

See the rest of the story at Business Insider