Socks during yoga?

Yoga is an activity that is typically done barefoot, but I often see one person in the class wearing socks during the practice. I'm not sure if it's that they're more comfortably with socks, or if they're a beginner and didn't know that it's done with bare feet, of if their scared of potential foot diseases on the communal yoga mats.

But, to be honest, I don't see any reason why not to wear socks. Your feet with stick to a good yoga mat regardless of whether they're socked or not, and the only time when it should pose a problem is when doing a balancing posture. Still, I think I'll stick to barefoot yoga because that's what I'm used to. What do you think?