Activity stream represent a user action within the site. A user can follow his/her own or friends activity within the site. Activity stream will be visible in each user profile.
A user point system is calculated based on user activity.
However with the new UserPoints system introduced, now user point and activity are no longer tied to each other.
Each activity (new wall post, new blog entry, etc) can be assigned a point value through UserPoints API call.
Please refer to UserPoints System for more details on how points can be given to user.
Creating New Activity
Before you can create or register a new activity, you will need to understand some basic concept.
actor
Actor is the person who carry out the action
target
(Optional) A target is a user who's object is being manipulated by actor
title
The actual activity title
content
(optional) A longer description of the activity
apps
The application name that the activity run on
cid
(optional) any unique id, unique to the application.