At least "three or four hundred people" (8:08) paid to go through direct messages (DMs).
Computer algorithms go through everything you post on Twitter (and Facebook, and everywhere, see 4:16) and "build a profile" about you based on keywords (your "interests")...
And my guess is when certain keywords are found, that's when the employees are alerted to manually read your messages.
They´re looking for interesting things to potentially leak, to hurt ring wing politicians, no doubt.
That old republican generation need to understand they can´t send sensitive info through social media, when all of those platforms are owned and operated by leftists. They´re like kids going through a cookie jar looking for that cookie with more chocolate chips in it. These days when they´re using algorithms too... They´ll find nuggets once in a while.