Ones who are trying to build a business these days.
I look at G+ maybe 3 times a day, never on my phone. Almost never comment, rarely + things. I have too many addictions as it is - I don't need another one.
I'm already getting a little creeped-out by how quickly the ad targeting algorithms are working while they follow me around. It's probably going to be second-nature in less than 5 years, but I'm not being encouraged to share more of myself on these "social" things by it.
The people who have to be Twittering and FBing and Instagramming and Videoing all the time must slowly go insane (if they aren't already).
I hope you find a way to get the most out of those things with a reasonable time investment. Good luck.
Cheers,
Scott.