To think that staff can't be expected to appear on work social media

[Sansan18]

I'm a very private person who was recently widowed and I live in a very rural, isolated moorland location. It's a beautiful area but I am quite mindful of my personal safety due to living alone.
I work in the public sector and feel under increasing pressure regarding social media.My own social media footprint is very small and I'm particularly careful about what I post, there are very few photos of me online.I run a small business with an online presence and has an issue a few years back where I was sent pornographic texts, indecent phone calls etc so that has made me very cautious.
My workplace expects us to post videos of our day to day work on FB and Instagram and I'm extremely uncomfortable with this. Comments from the public will typically lambast us for being employees of our organization, ask why we're doing nothing about waiting lists or comment that we're looking good/bad, tag friends and relatives etc.There's nothing in my job description saying I need to participate in social media and the content is driven by a colleague who's been on a half day course with an influencer so he's hardly an expert.His recent idea was that we should show the world what we were having for lunch and promptly videoed our entire table.
I'm thinking of opting out completely although I never gave permission to opt in.

Our's will often consist of "Look where X is today, why not call by and say hello, give them a wave"
There's usually a photo from the day or a previous event.
I appreciate that sm can be done in a more subtle way .

Ugh. I hate this. Two previous employers wanted similar which left me having to disclose a personal situation where I moved many miles away from an abuser and cannot be on any open social page. It made me feel very vulnerable because the rest of the team, who didn’t know, got annoyed that I left the room every time photos were taken.