Here's a new (to me anyway) social web site, Zimbio. They do have a library and information science area. Not much to it at the moment. One feature they have is a customizable OPML tool. Check off the areas of their site you are interested in receiving via RSS and it generates your link. You can specify how you want the entries sorted, by title, author, newest or oldest, most or least replies. Look in the tools area to play with it. Pretty simple but a nice feature.