YouTube is a good website for streaming free videos online. Be it tutorials, reviews, music videos, funny clips; you name it, Facebook offers.
Dailymotion is another video website like YouTube. In addition to TV clips, Veoh has music content across a wide range of genres. 9GAG is a collection of all things fun and goofy: funny photos, GIFs, gaming videos.
Most of us like to watch video clips on sites like DailyMotion or Vimeo from time to but websites that show free videos like trailers, guides, or just plain fun clips are TubePlus, Dailymotion, Megavideo and many others, as well as adult sites.