I think the biggest impact of real names on Quora is their impact on quality and personal branding. People post on Quora a lot more for vanity/business promoti

I think the biggest impact of real names on Quora is their impact on quality and personal branding. People post on Quora a lot more for vanity/business promotion than they do on Reddit. So from that standpoint, Reddit is much richer in what people will say but also a lot noisier. What it implies to me is that Quora has a much lower ceiling for engagement, especially since everything is public (unlike Google+ or Facebook) so people are especially careful about what they say there. In other words, Quora simply can't take over the world because the vast majority of people don't want to have their thoughts so publicly available.