<p>Parent here who never had a fb acct. Back in the day, I saw it as more of a kid’s realm and didn’t want to butt in; later just didn’t need another time-suck in my life. Over the past few years I think usage has grown among adults in their thirties all the way up to grandparents and has in fact declined among teens–at least that’s what our family has observed. </p>
<p>After my DD (now 18) became fb friends with her grandmothers, aunts, etc, it became something else to her entirely–probably a good thing as it kept her well aware that the content she chose to post was going to a very public forum. She uses b sporadically now, mostly for groups. These days she’s much more active on tumblr.</p>