Hey … psst. Hey, you. Get off Facebook there for a minute and let’s talk about … Facebook.

With over 400 million users, the world’s fourth-largest country is also both the place where people spend most of their time online and do most of their sharing, according to recent studies.

That is huge BROBDIGNAGIAN.

1. Timekiller

A Nielsen study released yesterday comparing the top 10 parent companies and brands shows that people spend up to seven hours a month on the site. Google, Yahoo and Microsoft have bigger user audiences than Facebook, but the time people spend on those companies’ sites combined don’t add up to Facebook’s crushing 7:01:41.

Mashable notes that in June of last year, Nielsen concluded that people spent around four hours a month on the site. This would indicate that Facebook’s controversial changes to privacy settings and redesign — both of which were rolled out within the past few months — have paid off.

2. Social Traffic Superhighway

Facebook estimates that its users share “5 billion pieces of content (web links, news stories, blog posts, notes, photo albums, etc.)” each week. Working with Gigya, Techcrunch ran some numbers and found that this amounts to about 44% of all social sharing online. Second place is Twitter, with 29%. Users’ ability to log in and spread content using Twitter (see the button at the top-right of this entry) and Facebook on most articles online no doubt contributes to this.

Facebook is also supremely dominant when it comes to sharing entertainment content, news content and chatting about live events.

Again, wow.

What is it about Facebook that causes it to crush all the others? Will Google Buzz break out and give FB a run for its users?

Where do you spend most of your time?

Gotta run — someone just tagged us in a photo!