In the post-scarcity society of Cory Doctorow’s fun Down and Out in The Magic Kingdom (which you can read for free), money has been replaced by whuffie WP: a reputation-based currency, an ubiquitous measure of how much other people like you. Now, of course, PageRank WP comes immediately to mind, no? (And here’s a good post linking both.) But the main difference till now was that whuffie was instantly viewable by anyone (through brain implants!) and PageRank is just a behind-the-scenes measure (though of course tremendously important).
No more. I installed Firefox Extension Search Status in a flight of fancy but it has become second nature to me to look down and right at the status bar icon where PageRank (and Alexa WP Traffic) is displayed. We are social animals after all.