Awesome idea – post “tagging” or “rating” on FB and G+

I heard a brilliant suggestion today from one of my workmates in the break room – the concept of mandatory tagging of your posts with keywords. Like "dead relative", "pets", “religion” etc. Would work great for both G+ and especially Facebook. We have it in WordPress and I have no idea why it doesn’t exist in the online social networks (yet?) Imagine being able to globally filter your friends’ posts based on keywords, so you never need to read about their dead relatives or pets or bollocks about God etc but you can read all the other stuff. Or maybe a "happiness ranking" that you can give your posts so that your friends don’t need to read anything that has a happiness ranking of –20 or a nudity ranking below 50. This way your fun, idle surfing time doesn’t need to be destroyed by having a story about your mate’s dead grandpa etc get thrown in your face, thus bringing down your entire week. Sensational idea. I should jump and patent it.