How do you find best posts within RSS feeds?

I follow alot of RSS feeds. I don't have time to read every article so I was hoping to lean on the wisdom of the crowd to help me find the best and most interesting posts within an RSS feed. I am looking for a website, service, or app that will help me to identify the best apps for that. I imagine there has to be something that will show you the most like, starred, bookmarked, or some other metric to determine the usefulnesss of the posts within the feeds that I'm just a casual reader of. Any suggestions?