This block can be configured to show three types of feeds:

1. Site-wide Activity Feed. This type of feed can be placed anywhere on your site and lists the most recent activities of all site users. There are two specific pages you might consider adding this block to:
   1. Home page. All users (including anonymous users) can view this block. By placing it in a prominent position on your home page, and limiting the number of activities to a small number (e.g. 3 most recent activities), it's a great way to call attention to fresh content and show that your site is active. 
   2. Login landing page. You might set up a special page to send users to after they've logged in (via the Login & Registration dashboard page). This page would include the same activity feed, but with a higher number of recent activities. This is similar in concept to The Facebook's feed when you log in.
      The main difference from Facebook is that activities from all users will be shown (not only from friends). When user accounts are used, concrete5 sites tend to be smaller, more community-oriented, and less likely to have the "friends" concept used.
2. Personal Wall. This type of feed, when placed on a user's profile page, will show only that user's most recent activities. This includes things the user has done elsewhere on the site (e.g., replying to a discussion post) or "wall postings" that have been made on that particular profile page.
3. Page-related Postings. This is very similar to the personal wall feed describe above. Postings can attached to a particular concrete5 page This is really powerful if you use pages as an "object", such as a product or calendar event. In that case, posts can be generated when someone purchases, updates, RSVPs, adds a comment, etc.

The Wall also provides a way for administrators to manage posting types (enabling and disabling as described above) and a block to be added to pages that display the activities.

Additionally, Spackle is a block that is placed anywhere on your site and allows an arbitrary posting to be shared. Depending on configuration, the message is added to the logged in user's wall, or the wall of the user whose profile Spackle is placed on.