I have a similar problem, but with people who use their FB accounts for work-related stuff. I had a friend I hadn't spoken to in years and was really looking forward to getting back in touch with her, but she's a music/drama director and all she ever posts is choir, the school play, this student who did so well, this picture of someone singing at a microphone, this list of cast members for the musical, this update for the choir competition, this schedule for the mid-season concert ... I eventually did block her because I know none of these kids and the details were getting a bit annoying.
I've also considered blocking people who don't really know how to use FB. Like my sorority sister who filled my entire feed with random photos of her kid's gymnastics meet because she didn't understand how to post an album of pictures all at once instead of one picture at a time. I'm proud of my kid too, but geez.