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Does this mean I have to put a +1 button on my site if I don't want it to come after all the sites that do have +1 buttons (unless I'm a canonical source like Wikipedia)? If so, it seems like a gross abuse of power on Google's part.

I would imagine Facebook could file an anti-trust suit over this.

I doubt it.

Does Facebook allow Google access to the signals it would need to weigh the relevant results?

I read it as having your site +1'd not having a button (but the button makes it easier for people to +1 your site).

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