To me, this is just standard privacy hyperbole that rears it's head every now and then. Anyone remember the headlines several years ago when "Google 'scans' your emails to serve targetted ads'? When was the last time you heard someone complain about that anymore? No one does, because it doesn't matter. Why should me sharing a link via a PM and my action be aggregated into an anonymous number worry me? How is the argu…
While I don't use facebook's messaging except on the extremely rare occasion that someone messages me when I have their web page open, I don't think sharing a URL with someone means I LIKE the content, there are many different reasons to share a URL.
No, I don't want facebook to "Like" links for me if I didn't explicitly say I liked them.