After taking your PKM class, I better understand what makes a personal network more powerful. I still use Facebook. I stopped liking weird posts form friends, eliminated some "friends", started using the groups with close friends stopped answering any type of Quiz...the Facebook algorithm now works to my advantage and I see only post about music and bands I listen to! Which is the main reason I use Facebook. But overall, you are totally right. Facebook is becoming the silent and devious devil of lore.