The Activities module allows you to display a list of the most recent activities in a network with direct links to view the relevant content or person. Activities can be anything from a new person joining your network, to a new comment made on a photo.
Settings tab  – choose the activities to display: your own activities – things you did across the different networks you are a member of, activities in this network, your friends activities (across the networks they are members of), or activities in the channel this network belongs to. Select how many activities to show in the module (there will be a 'Next' button to view older activities)
Activity Types – choose specific types of activities you wish to display/not display in the activity module. For example – you can choose not to display new blog posts, new events, or when someone changes their profile photos.
RSS feed - If you want to display a feed of activities outside your network, you can grab it using the Feed button that appears at the top of the module.
Allow replication - allow other users to replicate this module so that it appears on their network. The module will show the activities of the network it is displayed on.

Important: Activities are displayed to users according to the relevant privacy settings. So, for example, non-members will not see any activity that was done in a 'members only' module.