How come I am getting so many messages deleted on Facebook?

[Jeremy]

It says "This message was deleted automatically because it contained content that has been flagged as abusive or marked as spam."
Both mine and my friends' messages get deleted like that, even though it is harmless chat about things like college majors, sushi, and things like that.
Wtf? So Facebook is getting so crazy, they're going to shamelessly intrude into normal private conversations now?
They're starting to seriously piss me off

They suspended my account once because I made a highly-targeted ad saying "I love you", and blocked me from making comments just because I commented on my friends' post like 20 times in one hour.
But this one is simply amazing.

[Omkar]

Dude it's obvio. The friend who told you his messages are also getting deleted along with other friends are spamming your msgs. U can do nothing. Complain to Facebook.