F is for "Free"

Web 2.0 is a sharing environment that facilitates groupwork. Using the interactive tools that are now available on the Web, an instructor can create an environment that capitalizes on the student's enthusiasm for social networkiing. This allows the instructor to meet the students on their ground and engage them by using a series of creative media opportunities. Blogs, wikis, YouTube and more can allow for the exchange of ideas using groupwork methods.

The letter 'f' works for this because it's free.

Yes and FREE is good for students !