Social bookmarking is a way of collecting and sharing website bookmarks.
Watch the Common Craft video Social Bookmarking in Plain English
In your Google site, create a new web page that will:
outline what social bookmarking is
Other than delicious.com find four other social bookmarking sites and link to them form your page.
for each of the five social bookmarking sites, create a page that will list features that make them unique and you would entice you to sign up for their service.
organize these 6 pages using the side bar.