You probably know that YouTube is, by far, the top video destination on the Web.

Here are some things about YouTube, though, that you probably don’t know:

5 Things You Probably Don’t Know About YouTube Videos

1. People now watch a lot of YouTube videos. The average US Internet user watches over three hours of YouTube videos per month.
2. Music is the most popular category of YouTube videos – with 31% of all analyzed videos, followed by Entertainment (15%) and People & Blogs (11%).
3. Most people don’t pay attention to YouTube video ratings. There is no clear correlation between the rating of the video on YouTube and how often it is viewed. Videos with a rating more than 4 out of 5 usually have fewer views than those with medium rating score between 2 to 3.
4. The average length of a YouTube video is 4 minutes and 12 seconds.
5. 20-to-35 year old bloggers are most active in embedding and linking to videos within their posts with 57% of total videos coming from this demographic group.

These stats come via Sysomos, which recently analyzed 2.5 million YouTube videos, along with the sites that embedded or linked to the videos.