Personally, I do get why some feel the need to commemorate the passing of someone whose work touched their life. In such cases, it seems appropriate maybe to share a little text or something. And move on.
Beyond that, I fail to see the point. People have been lamenting the loss of Prince for 9 days straight now, changing their profile pictures on Facebook and sharing videos and performances, etc.
How could such an outpour of admiration and love be so sudden. Where were those people who are now calling him "The Mozart of our century" 2 weeks ago, where was that passion, where were the tribute bands?
Last time I heard of Prince was when he smashed someone else's guitar on a late night TV show, 2 or 3 years ago. And it was actually posted by Epiphone. I don't remember anyone but one of my contacts mentioning Prince, ever. But now it's like they've all lost their best friend.