5

Here's your info, thanks to Rebecca Chernoff: 1247 (non-employee) users on Gardening 1122 registered users 1030 users have an account on SO or SU or SF 1003 users had SO/SU/SF before Gardening I didn't ask for users who had accounts on SE 2.0 sites prior to Gardening, but as you can see from the above, that number is going to be pretty tiny.


4

They don't exist exactly as stated in your question. There are badges -- Announcer, Booster and Publicist -- for sharing a link to a post using the share button underneath the post. (More information in the Q&A: How can I 'try' to get the publicist badge?) On Area 51, you can get both reputation for each person that signs up for a site ...


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