Don't you just hate those people who won't say anything to your face?

So me and my friend got accused of taking the mick out of some fat girl, when we weren't. This fat girl and her friend didnt say anything to our faces when we were in school, but decided to start an arguement on facebook, say i've done something, and not tell me why, until her little friend comes online accusing us of taking the mick out of the girl, and accuse me of a whole load of stuff. This made me really angry i was so pissed off (i have anger problems) i just let them talk their bullshit to me and then when i confronted them in school they had **** all to say for themselve. i don't like arguements, but i dont take **** from no-one. i never start an arguement, but i always finish one. and an arguement on facebook isn't sorted. so i ignored them on facebook my last comment was i'll see what you got to say in school, and when i tried to sort it out, the other girl ignored me completely. I just wanted to ask her what she meant. She ignored me and i said "you not gonna call me a ***** to my face then? thought not, ******* coward." and she pretty much ran off. i wouldn't have stuck up for myself so much, but i didn't actually have a problem with these girls still they started acting so friggen pathetic. All i wanted to do was sort out a disagreement but these stupid cows wouldn't dare say anything to my face. why is it people say things on facebook they wouldn't say to people in real life? i rarely go on facebook because it causes so many arguements that piss me off and all i wanted to do was sort an arguement face to face. they also went round spreading **** about me to people. people like this make me angry, i swera i could have knocked her out. why are people such cowards and so two-faced?!