I've seen so much of this 2+2=5 thing and it seems to be somehow related to dunking on white people. I've actually seen things like "imagine there's 2 factories each with 2 machines in them, and each has half the parts to build another machine. These factories merge and instead of having 4 machines they can have 5 machines, that's how 2 + 2 can equal 5."
I'm seeing very serious people say this shit, all in the interest in proving that mathematics keeps reminding us that black people are retarded and like making things up which is just as valid as anything. This is one of those things where people laugh when they see it on Twitter, but rest assured there are talks in academia about introducing this in one way or another.