You know, the whole idea behind blogging is for people to be social and to share what excites us with other people. So it's only natural for us to want to share news articles, blog posts, videos, and whatever else with friends, too.
My only experience with this kind of thing is when I share articles or blogs I like. It's so simple to click on the little Share button to zoom something cool to my Mom or my BFF. Have I read about a tasty recipe at The Kitchn? Click it and send it to my hubby so he can pick up ingredients at Publix on his way home from work. Did I read something feministy at Jezebel? Digg it up, ladies!
I'm not sure about using this bit of Web 2.0 in the library. If we had an official library blog, we could post about events or new books and provide a Share link or a Digg link so patrons could alert friends to anything interesting.
That's about all I can imagine right now. It's very dreary out and my coffee is too weak this morning...