Lester Public Library has increased its Web presence by utilizing what is known as ‘social software.’
Social software as defined by Wikipedia (a fine example of social software in and of itself!):
Social software enables people to rendezvous, connect or collaborate through computer-mediated communication. Many advocates of using these tools believe (and actively argue or assume) that these create actual community, and have adopted the term "online communities" to describe the social structures that they claim result. They are used inside organizations or by communities of practice/interest
The more specific term collaborative software applies to cooperative work systems and is usually narrowly applied to software that enables work functions. Distinctions between usage of the terms "social" and "collaborative" is in the applications not the tools, although there are some tools that are only rarely used for work collaboration.