In reply to Timmd:
Well obviously the sneering, authoritarian, intolerant, conformist left will use it as a tool to enforce their orthodoxy and groupthink. Imagine how they would have employed it on say discussions about UKIP. Which does not matter very much to the health of the site, as the sort of opinions on matters like that are entirely predictable and it is hardly necessary to read them, nor would most people expect their opinions to be in any way altered by such a thread.
What is much worse is that this ridiculous piece of facebook juvenilia seems to be applied to the useful bits of the site, such as Expedition and Alpine. I normally try to help inquiries there, even if they seem naive or silly, responding in a constructive way - if I know anything about the relevant route or preparation question (how much use my advice is may be a matter of opinion). If "likes and dislikes" start to be applied and visible there, I would be much more chary of doing so.
So apply it to the trivial bits of the site if you feel you must, please keep it well away from the bits that actually matter to climbers, the bits about climbing.