I use FB to get parts & knowledge for my young timer. It's surprisingly effective. Lot of boomers ready to share I assume. 

I deleted Instagram years ago, I never got a feeling it is bringing me anything. 

Twitter I still do have account but I stopped going there months ago. It was not that easy, it is really addictive. 

LinkedIn is again surprisingly effective for small businesses to get attention and ultimately sales, you just need to be active. But if you don't need that, then I agree, just work anniversaries and stupid work offers.