In a recent post on the Digital Media & Learning blog the topic of Community and Writing in an Age of New Collectives was explored. The most interesting point was the recognition that writing is a community practice. This is likely the result of literacy emerging from oral tradition (see Walter Ong for an in-depth treaty on orality and literacy).
Besides the importance in understand that community encourages stronger writing, the post argues that to fully prepare students to write, we need to prepare students for community. Also, the audience is crucial.
One way to do this is by leveraging the communities that students are already participating in, from those in their local neighborhoods, to online communities such as those around fanfics or social networks. The ability of computer networks to connect students with others in different physical locations provides a fertile ground for teaching students how to interact with new communities of writers.
They argue that this is the responsibility of schools, but I would disagree. Schools only offer a temporary community for these students, whereas libraries offer a lifetime community.