5. Linked in
LinkedIn APIs Terms of Use
https://developer.linkedin.com/documents/linkedin-apis-terms-use
Linked in Developers
https://developer.linkedin.com/
What kind of data can I get from the API?
https://developer.linkedin.com/documents/reading-data
No LinkedIn data can be stored: The only exceptions
are storing the Member ID for subsequent API calls, and
storing the user's profile data when given explicit user
permission by the owner of the profile using a LinkedIn-
provided interface to obtain the user's consent.
7. Twitter
Developer Rules of the Road
https://dev.twitter.com/terms/api-terms
Build with Twitter.
https://dev.twitter.com/
What kind of data can I get from the API?
https://dev.twitter.com/docs/api/1.1