flickr, youtube and stumbleupon

I have had experience with Flickr and YouTube in the past.  Both outstanding sites.  I literally stumbled upon the site "Stumbleupon.com" when I was exploring other social media sites.  This one, though I have only played around with it, seems to be pretty cool.  Stumbleupon claims to help you find sites regarding your interests that you may not know about or find on your own.  As Stumbleupon offers you results of websites, photos and videos pertaining to your interests, you can rate and review what is being offered.  As you continue to use Stumbleupon, it gets to know what you like and dislike, therefore, creating better results for you each time you use it.  Take a look when you have the time!