Allen says the 10 million mark was hit Tuesday afternoon, and the overall user base has increased 350 percent in the last 6 days.
Using "surname-based analysis," Allen used U.S. Census Bureau data about last name popularity and compared it to Google Plus users with the same last name. The researcher used similar tactics for the international markets.
RWW explains that "Allen used a sample of 100 to 200 surnames to estimate the total percentage of the U.S. population who has signed up for Google Plus. He then used that number and a calculated ratio of U.S. to non-U.S. users (one U.S. user for every 2.12 non-U.S. users) to generate his worldwide estimates."
On July 4th, the model had user count at 1.7 million, and by July 9th that had jumped to 4.5 million.
Google+ is available to all Gmail users, and on Android. An iOS app is awaiting Apple approval.
For more general information on Google+, check here: The Google+ project targets Facebook
Written by: Andre Yoskowitz @ 13 Jul 2011 22:32
