The document discusses various Web 2.0 tools that can be used to facilitate online learning and social interaction. It describes blogs, wikis, microblogging, discussion forums, and synchronous tools like chat and video conferencing. Specific examples are provided of how these tools have been used in online language learning communities to practice the four skills, expand cultural understanding, and allow students to communicate with English speakers globally. The teacher's role is to select appropriate tools, guide their use for developing language and skills, and integrate them into classroom lessons.