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You should join us at Carbon :)

But the Carbon site says it's invite-only. Also, how do you go about advertising on a site with user sub-sites using Carbon?

That was an invite.

I'm not sure I understand your question. We put the sites in "circles" and advertisers buy a specific circle.

Your site is down :(

More likely your ad blocker. No alerts, seems fine over here and here: http://downforeveryoneorjustme.com/carbonads.net.

Indeed, it was blocked by my mobiles hosts file