I have no Iphone, or cell phone, nor will I ever have one, as I simply have no need of one. I am retired, mostly in the garage at home, and can't read small text, cant see small photos, can't find small buttons.
From what I see, it would seem that having an iPad (wife has one) or lap top (I use that) would be the way to conduct networking sites like this, if posting photos or comments.
If I were still employed, or had a need to be easily reachable, I'd have a smart phone. As it is, I don't answer the home phone, unless one of my kids or grandkids leaves a message and I call back....or I have an overwhelming need to talk with the breast cancer call center, or other telemarketing people...which I might do later if I become one of those lonely old men.
Best of all, no one is tracking my location, listening to my conversations, or bugging me with texts, calls, and other BS while I am sipping adult beverages and listening to Pink Floyd.