Over the years, users have clamored for a Facebook “Dislike” button. Now, finally, we know how Facebook feels about the request. Facebook Loves it with a big red heart. Or finds it Funny, with squinty-eyed, open-mouthed, laughing mirth. Or Facebook finds the requests Surprising with open-mouthed “Wow!-ness”, or with one-tear-rolling down the cheek Sadness, or...