I am just glad the constant linkedin is not facebook posts might stop. I don't understand why people keep these people as contacts if they feel that is detract

I am just glad the constant linkedin is not facebook posts might stop. I don't understand why people keep these people as contacts if they feel that is detracts from their professionalism. My circle is small, but I have seen 3 facebook type posts (solve x or whatever) and now one to two a day to stop treating this like facebook posts.