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You don't even need to click the like button. Facebook get the information as soon as you view the foreign page.

If you use Chrome(-ium), there's an extension for that. I believe there is an equivalent FF extension out there as well.

https://chrome.google.com/webstore/detail/ejpepffjfmamnambag...

People, including myself, seem to forget that Google has a far more pervasive network that has been operating for much longer.

By 'selling that click data about me' you realize that the only monetization tool Facebook has is a anonymized and aggregated ads tool...it doesn't sell click data.

I find there's a general perception (especially Slashdot) that this isn't the case, I'm not sure why given that Facebook's been fairly explicit about it in the past