Google+ Passes 100 Million Users

I'm doing some analysis this morning on the growth rates of Twitter, Pinterest, Google+, Foursquare and Facebook.

The big news today is that Facebook may file its S-1. I'm monitoring, but haven't seen anything surface yet. When it happens, it should show up with this link/query:

Meanwhile, I think it's noteworthy that Google+ membership has grown more than 10% since Jan. 19th when Larry Page announced 90 million users. I have them at 100.8 million users by the end of the day. They have been growing by more than 750,000 new users per day since the 19th, based on analysis of users with hundreds of different surnames. If that rate holds steady, Google+ will end the year with 345 million users. But as I have said before, Google has many dials and levers to use this year to increase signups and usage, including its Android 4.0 rollout. I stand by my prediction of at least 400 million users by the end of 2012.

Here is my earlier detailed analysis of growth prospects for Google+ in 2012:

It will be fascinating today, or this week, or whenever Facebook actually files, to see if they will announce something startling like 1 billion active users (have they been sandbagging?) or if they, for the first time ever, announce how many total user accounts they have. (They have always announced "active users", which means accounts that have been used in the past 30 days.)

It will also be interesting to see if Facebook delivers some other kind of "IPO Surprise," speculation that I read about yesterday in the Chicago Sun Times. Will they somehow carve out shares for Facebook users? Will Mark Zuckerberg do something unique to make his mark in the annals of tech IPOs, in addition to this being the largest internet IPO ever? Here's the interesting speculation:
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