Any General Wall Module?

Hello everyone! Please is there any general, public wall module I can install where my users can all meet and have conversations just like Facebook?

CB ProfileBook provides a Guestbook, Wall, and Blog tab; both allow user communications. Please see Advanced downloads section for latest release.

Thanks Krileon but what I'm actually talking about is a module that will display a stream of users' posts (that you're connected with) from their wall just like Facebook. Instead of just visiting each member's profile to comment, you can get to do that from this general wall component.

2. Is there also a module that displays all the members on the site with a thumbnail of their pictures?

3. How can I change the default avatar to that of my network?

2. Is there also a module that displays all the members on the site with a thumbnail of their pictures?

The module included with ProfileBook is able to stream a display of posts made to users profile.

3. How can I change the default avatar to that of my network?

You can replace the default avatar (name must remain) at the below location (is based off your CB template used).

components/com_comprofiler/plugin/templates/default/images/avatar/

Thanks Krileon but is there any module that allows for commenting on user's CB Blogs?

CB Blogs (if not using Internal model) uses Joomlas content display to display blog posts. So any comment extension compatible with Joomla content is also compatible with CB Blogs. Recommend searching Joomla.org for whatever comment extension you find most suitable.