Let users join your site, create profiles, find other users, and invite friends to join.

Let users sign in, view other members, leave comments, and see recent site activity from the top or bottom of your website.

Let users post comments and video links. Posts can apply to a specific page or an entire website.

Let users rate and review content on your page -- books, photos, songs, etc.

Ask your visitors questions relevant to your site via a poll that adds to their profile. Answers can enhance AdSense and the featured content gadget. This gadget works in concert with the Interests feature.

Let users recommend their favorite pages, surfacing your site's most popular content.

Display content from your site based on the interests of your site's visitors. Using Google site search, this gadget will automatically display content that matches the interests expressed by your site's visitors.

Help members sign up for your newsletter by providing their email address if they haven't yet specified one.