Wibiya is a great application to integrate social networks into blogs and websites. The application adds a toolbar to sites, which is located at a border of the screen. Wibiya connects to Facebook and Twitter accounts. It enables to access the content of the community and network streams and to login into particular communities. Here is a demo page showing the toolbar at the bottom.

Similar functions are offered by Google Friend Connect or the community bar of Six Groups.

Directory Sources: Live Blogging, Blogs – Social Networking – Social Media Software