Answer to Question 1
Student answers will vary, but should include reference to social networks broadening their offerings to become more portal-like. An example answer is: While Facebook can be a primary destination, the goal of Facebook is to keep users occupied and communicating with each other. One of the main goals of a portal is to provide avenues to third party content and other areas of the Internet. Although social networks are aiming to include portal-like features, to keep and grow audiences, the primary goals of a portal currently don't include social sharing.
Answer to Question 2
Social networks involve (1 ) a group of people, (2 ) shared social interaction, (3 ) include common ties among members, and (4 ) include people who share an area for some period of time.
Primary cilium and the Hedgehog pathway
The Primary Visual Pathway
Activation of the Primary Gustatory Cortex by Taste Stimuli
Oil is the primary fuel for transport
Primary Active Transport
Primary growth in a shoot