YouTube is a community site for watching and sharing user made videos. That’s because YouTube enables all members to easily upload and share video clips on their site and across the Internet through embedding these videos in websites, blogs, mobile devices and email.

Watching and sharing means YouTube, like many other social networks, serves multi purposes.

On the one hand you can get exposure for your videos, on the other hand you can watch what others think and look for popular topics and trends. You can find plenty of topics at YouTube. Since it’s a Google company, their search capabilities are huge.