I saw this a few days ago, and found it so inconsequential that I knew I wouldn't have much to say about it. So I saved it, figuring I'd put in a "what i watched" post with a couple of other movies. But since then, I saw two movies that go together (last 2/3 of a trilogy), and one By Request. So I'll write this now, if for no other reason than to remind myself I actually saw it.
I am far from the only person to compare The Circle to Black Mirror. It plays very much like a mediocre episode of that TV series, only it's twice as long so it seems more boring. A bunch of my favorite actors are here ... Tom Hanks, Bill Paxton (his last movie), Karen Gillan, John Boyega, Patton Oswalt. Emma Watson is the lead, and I don't have an opinion on her, so she's not one of my favorites at this point, but she's OK in this. But the truth is, I'm not sure why I watched it in the first place. Seriously, if you get the urge to watch this, go watch Black Mirror instead.