ComScore – a web-traffic watcher company has revealed that Google Plus has witnessed more than 20 million unique visitors in less than a month.

It is three weeks or so since Google launched its social networking platform which was welcomed with both hands by users.

It is said that Google+ has shown such a steep rising curve which no product had ever shown so far. Despite of the fact that registration on Google+ is still invitation based, it has managed to get 20 million users in three weeks after its launch.

Also the search-giant Google has not completely launched its product to all its customers – as one can imagine, Google still has a potential of one billion unique visitors on its search engine, which is somehow unused at the moment.

Distributing the overall usage worldwide, USA tops the list with more than 5 million users while India comes second in the list with around 2.85 million Google+ users.

Integration with Gmail, Picasa and above all, the new toolbar (sandbar) above Google pages has given a new boost to Google Plus’s popularity.