I am amazed at the number of public libraries using YouTube! I think they each achieved their goal of reaching a diverse audience. I think they wanted to reach those who don't watch tv often, have no cable access, and who like to support and follow their library online. I did notice that some things were targeted specifically to different age groups, and thought that was nice too.
I think that videos posted online would be a great tool to use for encouraging teens and adults to participate in library programs. I also think if they're updated regularly that this would be a great place to post information about upcoming progrms on your library's channel.
I certainly hope that this is a tool we can somehow utilize at our library in the future.