Social Graph
A social graph in its broadest context is the mapping of everyone and how they are related. The term is usually used to refer to online identities, e.g. as used within social networks. As of 2011, the largest social graph in the world is Facebook’s, which contains the largest number of defined relationships between the largest number of people among all websites due to the fact that it is the most widely used social networking service in the world. (Source: Wikipedia). Concern has focused on the fact that Facebook’s social graph is owned by the company and is not shared with other services, giving it a major advantage over other services and disallowing its users to take their graph with them to other services if they wish to do so, such as when a user is dissatisfied with Facebook. Google, has attempted to offer a solution to this problem by creating the Social Graph API, released in January 2008, which allows websites to draw publicly available information about a person to form a portable identity of the individual, in order to represent a user’s online identity. You can see what your Facebook social graph looks like by adding the Social Graph App. Mine looks like this:

Activity Stream
The activity stream is a chronologically ordered list of activities of ‘friends’ or contacts that have been mapped to the ‘Social Graph’ for each individual user. Facebook users will no doubt be familiar with the activity stream (referred to as the ‘News Feed’ in Facebook) showing what their friends are doing and saying. Only people who are in the user’s social graph (i.e. those who have been confirmed as ‘friends’) will show up in the activity stream.
- a shared interest or hobby
- working for the same organization
- working in the same location or region
- having a similar job
- an expert in a topic you are following
- a thought leader
- etc.
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