The cost of online advertising on popular internet portals runs into thousands of dollars and still the slots are filled up pretty quickly as a very large pool of advertisers are competing for that limited amount of space.But thanks to the rise of social networking sites and user generated content sites like Blogs and Youtube, advertisers aren't complaining as they can still find enough free space to advertise.
And some say that the supply of, and demand for, ad-friendly Web pages will continue to grow.
Source: Blog, social sites offer plenty of ad space
