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Why use Context.MODE_PRIVATE or Context.MODE_WRITABLE?
public static boolean save(Facebook session, Context context) {
    Editor editor =
        context.getSharedPreferences(KEY, Context.MODE_PRIVATE).edit();
    editor.putString(TOKEN, session.getAccessToken());
    editor.putLong(EXPIRES, session.getAccessExpires());
    return editor.commit();
}
public static boolean restore(Facebook session, Context context) {
    SharedPreferences savedSession =
        context.getSharedPreferences(KEY, Context.MODE_PRIVATE);
    session.setAccessToken(savedSession.getString(TOKEN, null));
    session.setAccessExpires(savedSession.getLong(EXPIRES, 0));
    return session.isSessionValid();
}

context.getSharedPreferences(KEY, Context.MODE_PRIVATE)

context.getSharedPreferences(KEY, 0);