6. Digg, Reddit

I can search digg for a specific topic and see which have been dug the most.  I could care less if I'm more 'popular' in my social media networks.  I don't use Reddit or Twitter, so their combining doesn't effect me in the slightest. You can't completely ensure any source is completely accurate, every single site you will get information from will be biased in some way.  Or just completely wrong.