Yeah !!
that’s a pretty important thing. In a cyber world where we hardly ever get to meet / talk to each other. How does another human being gets to know you to the extent he/she needs to before running into a conclusion with the review written by you.

It’s one of the most effective way to personify yourself in a impersonal world like Internet.

Hmm... don’t tell me, this didn’t happen to you. Didn’t you ever run into a review, after reading which made you think ’’hmm... something’s there, lemme check why there’s little deviation in the opinion’’ & you promptly check the profile page and :-) with ’ahh, now I know’. Well, without much analogies, all I could say is, Profile is like something that makes you as ’’You’’ to the rest of the people on the site.

What to Include:
Little personal background, details could be socio economic, education and profession. That pretty much gives a reader, to understand, what they can formulate your image within themselves.

What to Avoid:
Finer Personal Details, which can be used by malicious users to harass you.