Numbers from Experian Hitwise show that Google+ showed big gains again last week. For the week ending on July 16th Google+ saw over 1.8 million total visits. This is a 283% increase from the previous week and an increase of 821% from the week of July2nd.
The following chart shows the total US visits to Google+:
Other pertinent stats released include gender & demographic data, overall site popularity and traffic sources. Hitwise states that 57% of the total visits are from males, even though other reports show a much higher percentages of actual users being male. The largest demographic of visitors over the last week four weeks was the 25-34 age range which made up 38.37% of the total traffic.
Google was a leading traffic source for their own social network, sending 56% of the upstream traffic to Google+ from their various properties. Google.com led the way for this traffic, accounting for 34% % of the total upstream traffic.
For more information, see the Experian Hitwise blog.