Google's latest foray into social networking already has 20 million users and 1bn items shared. This has not been a surprising move for many.

Google has opened its ambitious social networking site Google+ to the public, having attracted more than 20 million users for aits 12-week invitation-only trial. The public launch marks a significant moment in the search giant's challenge to Facebook, which has almost 800 million active users around the world, and the messaging service Twitter, which has more than 100 million members.

Unlike Facebook, where you have to be a "friend" with a counterpart, or Twitter, where "followers" and even unregistered visitors to Twitter's website can typically see anything that someone tweets, Google+ uses "circles", where a posting cannot be shared more widely than its creator wants. At its broadest, that can be completely public – but it can also be a circle only of one person, or just family or close friends.

Its estimated that Google Plus invitations is making a Buzz in the online world. Now Google has blocked the registration for those who got the invitations already. The traffic is building up with 1900% times every hour to official Google Plus website.

Those who received the invitation might be able to see this screenshot.

"Already invited ?. We've temporirly exceeded our capacity. Please try again soon"

nmarketers is redistributing Google plus invitations for free. Google plus has hit with a huge momentum in the social media space and directly taking over Facebook share. To receive your invitations, Just drop your email ID as the comment and thats it.

For those who would like to the invitation. Please drop a comment out here.