It's nothing to do with anonymity - everyone here is as anonymous as they choose to be. For example, I haven't a clue who Teribus is, or for that matter NicoleC.

But I know that I can reasonably assume that the person who came in as NicoleC just now is the same person as the NicoleC who posted previously, and the same for Teribus. I can't assume that for GUEST. Just click on that and see why. (You need to be a bit patient for the link to kick in.)