Personally I don't consider real name or real photo to be much of an asset of any of the circles I was in on Twitter. In fact, in my experience the ones with real name/real photo (or what seemed that way) were generally the least interesting posters. They were never willing to put out their own opinion, especially on controversial topics. In fact, in the kind of groups I was in (let's say political activism), having your real details on there is anything but an asset.
Not having a real name on Twitter isn't even a good heuristic for anything.
In a lot of circles, a Twitter profile with a "real photo" as the profile picture usually means you're looking at a spambot with a profile picture scraped from either Facebook or a dating site.
It's not a good heuristic for unique opinions -- sure (see: LinkedIn, the most horrifyingly boring social network feed). But it is if you want to filter out hate speech, which a lot of people do.
But my point is not real photos/names as the be-all, end-all. How about many heuristics, and let users filter accordingly? All this data available and none of it is used to improve the user experience, at least as far as I can tell.
Not having a real name on Twitter isn't even a good heuristic for anything.