almost every site links back to facebook therefore it has tons of millions of backlinks which ultimately result in PR = 10
The thing with sites as big as them, they obviously can't be treated in the same manner as the average webmaster.... My thinking behind this is that if you have an unrelated link into your site or one from content such as adult etc... You can be punished by Google but yet sites like FaceBook get nothing but good links...
almost all of people linked to facebook. They like it, so why it can't be happened for facebook got PR10? especially i think the backlink is good (oneway backlink)
PageRank is a quantitative measure of link popularity, and Facebook is insanely popular. There's nothing surprising about its PR.
Facebook deserves a perfect 10 PR as it's the most used website in terms of visits and time spent on the site! Mark Zuckerberg is a genius, and I'm really glad he wants us Web Developers to leverage Facebook's strengths and not wipe out everyone by creating competing products. He sees Facebook as a facilitator and wants new start-ups to build on top of the Facebook Platform while keeping his company small. FB only has around 100 software developers! That blows my mind since I worked at Microsoft as a contractor and I was 1 of over 5000+ on campus in Redmond! Check out this 60 minute video with Mark at the Web 2.0 Summit 2010, then go build a Facebook Application, that's what I'm working on!
Facebook, get lot of traffic, backlink everyday. It is also the most popular social networking websites all over the world.
Facebook the most popular social network, averagely which is being used by every internet user, so having a PR 10 is not shocking.
I'll second that... Adobe and google.com are like the only site i know with PR10... Even Google.co.uk doesn't have it...
It is obvious, so many High PR websites has facebook share buttons. So that gives facebook a backlink making it PR 10. You see twitter is PR9 and i am sure twitter will be PR 10 very soon, may be right in this next update?
Google doesn't have any problems with social networking sites! Its just that its really tough to get pr 10 and facebook's the only one to get it till now.