Considering the fact that Discovery Communications bought HowStuffWorks for $250 million, their emphasis on quality should come as no surprise. They use various forms of media to explain a wide variety of complex subjects.
Big Think is what happens when you put television producer Gary David Goldberg and former Harvard University President Lawrence Summers together. The pair envisioned their website becoming a YouTube for intellectuals. However, it became much more. The emphasis on quality content makes Big Think the best philosophy website.