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What is considered an active user?

If you follow the links to the source Globalwebindex doc, they defined it as "Used or contributed to in the past month".

So Google is counting YouTube users who save videos to their playlist as "active users".

Absolutely disgraceful. I feel sorry for advertisers that are going to be tricked by this.

Read my other reply.

I want to know this too. I don't know of any of my facebook friends that actively use Google+.