To view the site-wide activity streams (i.e. the status updates, photos, etc of all members) go to the Chochalan page, which defaults to the All Members tab. You can also post your status update from there to instantly participate in the chochalan. Also, you can click on the Show: dropdown filter to view only certain types of activities.
To view only the activities of your friends, click the My Friends tab. You can also view your friends’ activity streams from My Account–>Activity–>Friends
NOTE: The visibility of members’ activities will depend on their privacy settings.