This thread reminds me of that old rant about the 7 types of insufferable Facebook posts: https://waitbutwhy.com/2013/07/7-ways-to-be-insufferable-on-facebook.html
Yeah, there are a few culprits in my friends list who are fkg annoying, but - hands up - I think I'm also guilty of p'ssing people off as well.
There is an ex of mine who travels extensively for work and will always post very well framed, perfectly composed, ultra saturated photos of groups of people sitting in a restaurant or bar with him, all happily smiling at the camera, shots. Of course, he's always the one holding the camera (and such a person is always easily identifiable as the one who is 'look at me' desperate and insufferable on social media). His profile is rammed with photos documenting all of his meals out, the travelling he does with his partner (and now wife but - shock - there have been zero photos of their wedding which is very out of character and odd). I suspect, despite his penchant to dine out, he convinced his wife to have a small ceremony at a registry office. Nothing wrong with that; it's just very surprising given the image he has curated of himself on his profile. I once reconnected with my ex back in 2010 and we went on a trip together. During that roadtrip I got taste of what he's like when it comes to his incessant need to take photos of everything. The level of control was insane. He basically sets up the shots and will tell strangers where to stand, how to hold the camera and how to frame it, etc. Then there's all the editing It takes ages. It really is something else. Now, 15-16 years on, this is still his MO. He was bullied badly as a child and I think this is his constant "F.U" to the individual/s who bullied him. I guess people who seem annoying online have their own demons.
Another relative comes to mind: a middle-aged woman who has never paid for any child care and pressures her local in-laws to take care of the 3 kids. Said woman has never paid in-laws and, of course, this means lots of money to go on no-end of holidays and there are also lots of posts documenting all the concerts she frequents. Judging by the handful of likes she receives on her posts, she is not liked much, which is the case within the family.
As for myself, I post holiday photos. I strictly keep to five photos or fewer, but I suspect people know that money is being spent and that can rub people the wrong way. I don't post photos of my DC standing by the front door for their First Day at School. I don't bother with World Book day or the Christmas Elf. All of that is so ugh. I also don't talk to or congratulate my DH via social media when I can just turn to him offline and say it. No check-ins during any health-related visits and no moaning, vague attention seeking posts or humble bragging. I do, however, post the occasional photo of my DH and DC.