What are you ashamed of? / Anonymity

In colloquial use, "anonymous" is used to describe situations where the acting person's name is unknown. Some writers have argued that namelessness, though technically correct, does not capture what is more centrally at stake in contexts of anonymity. The important idea here is that a person be non-identifiable, unreachable, or untrackable. Anonymity is seen as a technique, or a way of realizing, certain other values, such as privacy, or liberty. source

The effect of anonymity / Disinhibition

Influencing factors. Anonymity, asynchronous communication, and empathy deficit contribute to online disinhibition. Anonymity can make a person feel safe online, like a different person, one might even take on a new persona. Possible influencing factors toward online disinhibition include anonymity, invisibility, asynchronous communication, empathy deficit, in addition to individual factors like personality and culture background. The manifestations of such effect could be in both positive and negative directions. Thus online disinhibition could be classified as benign disinhibition or toxic disinhibition. source