Meta STOLE the source code from Twitter, this is the only way Zuck could have a competing product so fast
Nah, this stuff is not that hard, it's a left turn from existing FB Messenger, that's all.
For starters, their stacks don't compare. At all. Here is Twitter's SD pre-Musk, this is all public knowledge (#codeKarle is awesome). That said, I don't know what it looks like today: