ALL SNSAPI users must apply their own application keys to enable a certain platform (if it requires OAuth). Not only developers need a key! All the OSNs we currently touch do not allow other users to authorize test stage Apps, e.g. only the developer can authorize it. In this case, everyone needs to register as a developer first and apply their own key. Whenever you see sample usage of SNSAPI, remember to change their app_key and app_secret to yours. Alternatively, you can ask the key owner to assign you as a test user if you really want to use others' keys.

Expiration: 5 years

Expiration: 30 days

Expiration: 7 days

Expiration: NONE

Note, twitter do not need to authorize it every time. As developers, they provide you a permanent key to use. Very convenient!!