There are plenty of ads here, but mainly in the guest mode. Just log out and refresh this page.
While logged in, the only ads I'm aware of are from certain keywords, e.g. these keywords Nero, UltraISO, clonecd become affiliate links in this post, unlike Farcebook which continues to display heaps of ads, this time based on the user's personal information. The only other advertising here is the odd ad-square that appears on the upper-right, usually on the homepage.
Personally, I really don't like websites that present pop-ups and especially flash-over ads. If I click a news story and see a flash-over ad or a heap of ads, I just click the back button and head for the same story elsewhere.
As for Facebook, I've never had an account there and never will! It's just become a viral social monster where a "friend" is a number and the idea seems to be to score the highest count. I've already seen stories mentioning that they are disappointed by its popularity in Russia and China, as if they expect be the #1 website globally. :Z
Most of my real friends are on MyCE and the rest can be reached by Telephone, Instant Messenger or E-mail.