1) This is by any source I can find, incorrect. Twitter had ~8,000 employees when Musk bought it. After layoffs that was trimmed to a low of around 1,500 employees (19%), and today it has around 2,800 employees.

Also worth mentioning that a lot of Twitter's products are built on X.ai which has 1,200 core employees on Grok with 3,000+ on the Datacenter build-out side.