I do a different test. It's called "Do you care about me?"
If I got in a car crash over the weekend, would you even know? If you found out, would you visit me in the hospital?
If the answer is yes: but they're family, I already have their contact info. For non-family, that group fluctuates, and more often than not, it's zero. I'm fine with the number staying there. Benefits include: Less drama, breakups, regrets, and more time to get work done.
If the answer is no, which it mostly is: I feel I save time and am more self-honest not connecting with them.
But as I get closer to 30 I feel less interest in connecting with others. The only exception is when I travel abroad and the surroundings are more intriguing.
On the other hand: Social media is a great marketing tool. I'm fine if people use Facebook however they choose. And I also agree with pruning boring content in favor of subscribing / liking manually.