After being invite-only for nearly 3 months, Google+ is now open to everyone.

On its official company blog, Google+ wrote about the 99 improvements that have been made to the product since launching. Google’s Vic Gundotra said, “We’re ready to move from field trial to beta, and introduce our 100th feature: open signups.”

Today’s update also comes with big improvements to Google+ Hangouts, which includes the ability to use them on Android devices (version 2.3 and higher). Also included is a search feature, which is somewhat of a hybrid of content shared on Google+ and results from the web.

When the service first launched in July, Google+ attracted over 20 million visitors in its first month. However, the service has lost some of its luster since then, with controversy surrounding branded pages. Now that Google+ is open to everyone, we’re all eager to see what this service will do to the web.

Certainly Google+ will eventually change the web marketing world as we know it.  Since this is Google’s own product, they will rank social tick marks using the “+1″ Button over those coming from Twitter, Facebook and social bookmarking. This will likely impact organic search results, as web pages with the most +1′s will probably populate earlier on Google search results.

What kind of impact do you think Google+ will have on the marketing world?