[leelin]

Be careful of these numbers being biased lower than the real medians and averages.

Glassdoor's gimmick is "tell us your salary and we'll tell you what everyone told us." They'll keep bugging you as you use the site until you finally relent (or play cookie / session reset games).

I'm guessing that means most people who sign up are somewhat insecure about their salary level and want more information. The truly satisfied or highly paid folks either don't use the site much or only need to look at one page and leave satisfied that they are doing just fine.

[mynameishere]

I would guess the opposite. People who are comfortable in making more than average would be more willing to divulge, even anonymously.