2/ You can get one separate window for logging in facebook while clicking the button.

3/ After logged in facebook, make sure that the facebook login window closed automatically.

4/ Now the facebook friends list will be displayed.

5/ You can post wall to your profile and your friends profile.

6/ When you post the wall, make sure the site name displayed below the text box.

7/ The site name should be your currently loggedin sitename.

9/ After posted the wall, you can check it in facebook site. The wall will be displayed in your profile and your friends home page.

10/ Also, You can invite members to the currently loggedin site.

11/ Check the invite message in facebook site notifications.

12/ Check whether 'Logout of Facebook' works properly.