Useful post on Steve Wheeler's blog. He proposes the following digital literacies:
•Social Networking skills
•Transliteracy skills
•Privacy Maintenance
•Identity Management
•Creating content
•Organizing content
•Reusing/repurposing content
•Filtering and selecting of content
•Self presentation
I think these are really important. Each would take a deal of unpacking but they are demonstrable and could be integrated with language skills to form a scaffold for online language use. Such skills are a vital part of the armoury of any online activity for tutors. Of course we'd have to replace that z with an s :)