Facebook related - won't bore with highly intimate details, just an outline.
A mum at our school, seems lonely (seems to have gone NC with her ex H), often mildly attention seeks on F/B and would like to be more "in" with the year group, IMHO, a quite friendly group of mums, than she is. From passing conversations I can see that too much of her company would be fairly irritating in a "poor me"/serially taking offence kind of way and presumably others have been there, got the t-shirt and withdrawn from socialising with her above the polite minimum.
From the early days of reception class, most of us accepted each other, including her, as F/B friends, mostly for ease of communication about school related stuff.
This morning she took offence at a totally harmless posting by one person which had nothing to do with her at all, so effectively butted in, just to take offence thereby causing loads of grief/hassle and being a total time thief in terms of messaging to sort out so everyone was happy again. She doesn't seem to need to work so wasting time at the weekend placating others etc. isn't a problem for her, she's got all the time in the world to pursue hobbies etc whilst most of us are caring for younger children/babies Mon-Fri. or at work.
Facebook is a very useful tool for busy people, as many of us parents are, we've commented that we'd be lost without it (we're a fairly intelligent and sensible bunch plus no-one has pulled this sort of stunt before), but clearly it becomes the work of the devil in the hands of mischief makers.
I'm pondering whether to de-friend or not, I'm fuming really that she tried to cause serious trouble for one of our group.