Who Uses Ustream to advertise?

[jelboy]

I have found on Ustream that many people just post videos that is merely a link to another website. I am one of many people who ends up looking at those sites. I think that these video even if not interesting can still create a lot of traffic through to your site. I would like to know, when are these videos most effective in sendinf through traffic to your site, and what type of niche does it generally work for ?