I'm a teacher and I am tired but haven't felt the need to moan about it on facebook. I have seen some memes being passed around though.
For me the tiredness of end of year isn't because we've taught for 13 weeks (the longest term we have here) broken up by some bank holidays (which actually make for more tiring less routine weeks) but because the children are in end of term mode and I have a long list of jobs to get done with the deadline of next week.
There are practical jobs -clearing out my classroom (and I always ensure it is clear of everything not just the stuff I put in), moving things to my new room, moving the children's things, ensuring they all take the right stuff home.
Admin tasks -handover notes, filing, reports for children moving to new schools, updating progress trackers, requesting support for children for next year, evaluating support given this year. These are all set for a two week timeframe and cannot be done sooner or later.
Emotional work -many children need to talk to me out of class time as they find the transition to a new teacher, mix up of friendships, long summer, hard. The classroom is too busy a place to talk so they need time outside of that.
And on top of that I still have to plan and carry out lessons (although I've cut my marking down to a minimum). These lessons actually have to be better than usual as my audience is thinking about other things -new teacher, summer holidays!
Timetabling is all over the place with special events on too.
And I still have to come home and cook dinner and play with children and put them to bed (and hope they sleep through) and up at 5am with them...
And other proffessions have their moan about a particularly busy time -End of tax year for many finance people. Or towards the end of a particular project or when there is a contract up for bidding/renegotiation.
So yes we moan, but not because we don't like our jobs or because we're the only ones suffering. And it is spread around SM because teachers are friends with teachers and we all hit this around the same time (although USA and Ireland earlier, Scotland now and England later).