It's not a matter of "having anything to hide"; it's a matter of privacy, which many people are misinterpreting. As some people have posted, they do it out of shyness, or a sense of security, or they don't want to be bothered if they come just to read the posts.

It's a feature offered here that many members use to their advantage, and it's unfair to judge them or label them as hiding something if they choose to be invisible.

Dolfin