Before you, I never knew how many of my friends and relatives were grammatically retarded. No, that's not fair. Let's call them Grammatically Apathetic.
There are some really annoying people who seem to have come from the womb knowing grammar, who could diagram sentences under heavy fire, and who may or may not have been kicked out of classes for correcting their teacher too many times. I am one of those people. It's like being able to hear at a frequency that only dogs and English majors can hear. Bad grammar can be absolutely earsplitting when others are unaware of any sound whatsoever. You can imagine that Facebook can cause such insufferable prigs (such as myself) some degree of discomfort.
So just for fun, let's review one of my pet peeves quickly, shall we?
TO is a preposition, identifying the object or expressing motion. For instance: Erma is married to Percy, or He left his bike chained to a post.
TOO is an adverb (modifier) or an adjective. For instance: I ate too much. Too can also be used as "also." For instance: Eunice is coming too.
Sorry about that. You may go now.