Use Facebook application login

[tishun]

We need not require our users to actually login in order for them to use the graph API, instead we can use app login, see login overview

[tishun]

Need to further investigate this.

Using the public API would help protect user's privacy (using public profile pictures)
In the same time it would not allow calendar sync.
Calendar sync would however require submitting the code to Facebook so they could approve the usage of this API.

[tishun]

The access tokens we can use are three types. We could utilize the App Access Token if the user is reluctant to provide their credentials.

Changing to enhancement.