FriendFeed does not provide link of each post right from typical page. Comparing with Blogger's link field: it links to embedded URL, when supplied, not the post itself.
To find the post's URL itself:
At the post's actionable command line, select "Share". Its dialog pops up.
Under "Share elsewhere" section, look at field: URL.
This is useful when we want to review comments/discussion, for example.
There are 2 major meanings according to Wikipedia. So, using each term correctly would be nicer in our language.
Social network: a social structure made of nodes (which are generally individuals or organizations) that are tied by one or more specific types of interdependency.
Social networking or Social network service: focus on building online communities of people who share interests and/or activities, or who are interested in exploring the interests and activities of others.