Yes, yes, the very idea of being deleted on Facebook is so teenaged, but that's exactly the point so hear me out! Firstly MIL isn't really MIL as me and dp aren't married, however we are (recently) engaged, have a toddler together and a bump due any day now so for the sake of easy abbreviation...
MIL's relationship with dp has always seemed fair, with the odd blip mostly caused by him not replying to messages immediately or sufficiently gushingly; dp is the unsentimental, practical sort and MIL is extremely emotionally needy. She has had a properly shit last few years in fairness but the emotional neediness is more of a lifelong thing. Anyway, they are who they are.
So they tick along much without any involvement from me. I don't know unless I probe whether they're currently in contact regularly or whether one or other is "ignoring" the other; dp ignoring pages of dramatic messages or MIL ignoring dp's calls; but I encourage him to be kind and send her updates. My contact with MIL was mostly limited to the odd visit or her previously "liking" the pictures I put up of her grandchild on FB. Honestly this is 99% of my FB usage with little family close enough to see ds often. The visits have always seemed to have gone well (we get along), although over the months I've heard she's mildly bad mouthed me to other relatives or made half mention of some imagined passive aggressive behaviour on my part, but I've brushed it off as "whatever" as she does love to bitch about people even to me.
So I hear her and dp haven't spoken lately - he's not sure if they've fallen out - so I look up her FB to see if she's okay, any news or whatever - and she's frickin' deleted me! From TWO FB accounts!! Which irks me because, you know, why?? Also I've chosen to take offence on behalf of ds who she clearly has no interest in knowing anything about, not least because she didn't acknowledge his recent birthday in any way at all, no matter how small. And obviously she's not interested to know when he next grandchild might be born, as my FB is probably the only way she'd find out what with her and her son not talking at the mo.
So rather than being a passenger to their relationship (as dp would have me be, and has halfheartedly proposed I let him sort it out and get everyone back to happy-smiley) I'm all up for calling her out and saying "look here lovey, have we fallen out? Because this is news to me!!" - as is my diplomatic style. See, I'm definitely not the passive aggressive sort! AIBU??