Wall street reacting to their middling new users numbers during a pandemic. There's also just a bit of a tech stock drop right now because other companies failed to meet earnings estimates.
It'll likely rebound; especially since they blew away earnings estimates unlike the other tech biggies.
the amount of users didn't grow as expected.
facebook, amazon, and apple also didn't wow investors and their stock went down (though not as bad as twitter)
alphabet still doing well, up 4%
The real answer? Individual stocks are too volatile and investors are too emotional.
If you want to play a tiny amount like a gambling budget then go for it, but if you are looking to participate in the markets you really should be diversified into various index funds/ETFs/actively managed funds where appropriate.