After months of beta testing, Digg has finally rolled out its version 4 of Digg.com. The new site features an all new look, something that wasn’t seen when the site went from v2 to v3. Digg has also added more social features, and is now almost like Twitter, in a sense where users can follow and be followed by others.

Popularity: 4% [?]

Amazon has announced that the first book to reach 1 million copies sold on Amazon is Stieg Larsson’s “The Girl With A Dragon Tattoo”. The book has also been on the New York Times best seller list for a while, as has Larsson’s Millenium crime trilogy.

Popularity: 4% [?]

Posterous, the mini-blogging service and Tumblr competitor, is growing at an unprecedented rate, over 700% per year, according to Quantcast. Posterous reportedly has 5.3 million monthly unique visitors — 2.2 million in the U.S.

Posterous was founded in 2008 and has so far raised $5.14 million in VC funding.

Popularity: 6% [?]

One of the big features about Firefox — besides being a superior browser — is that it offers thousands of add-ons to improve your browsing, email, bookmarking and virtually everything else. Now Mozilla has announced that Firefox add-ons have reached an impressive 2 billion downloads.

Firefox now has almost 25% of the browser market share.

Popularity: 7% [?]

Google’s Blogger service is alive and kicking well, and is still has the most blogs of any blog network out there.

Now Google has added real-time stats to blogs on Blogger, which display traffic and other stats for blog posts on Blogger.

Popularity: 6% [?]

Digg has been losing traffic and audience over the past year, and rightfully so, the service hasn’t evolved in a long time and there isn’t much “social” to it when it’s only a handful of users to account for most of the submissions to the front page. However, Digg today unveiled the brand new Digg.com, which adds new features, making it look pretty much like Twitter and Facebook.

Popularity: 7% [?]

WordPress.com, the hosted service of WordPress, has passed 200 million blog posts, just a day after they released WordPress 3.0 to self-hosted users. WordPress.com has just over 11 million blogs, and they’ve now collectively posted over 200 million posts. On top of the 11 million hosted blogs, WordPress powers some 13 million blogs using WordPress software.

Popularity: 6% [?]

The third major release of WordPress has been released, version 3.0 adds a ton of new features, including the ability to run multiple blogs on the same WordPress installation, and general features that make WordPress more of a fully fledged CMS than just a blogging platform.

Popularity: 5% [?]