code: @Override
  	public String getAccessToken(Context context) {
  		UserProviderCredentials creds = getSocialize().getSession().getUserProviderCredentials(AuthProviderType.FACEBOOK);
  		if(creds != null) {
  			return creds.getAccessToken();
  		}
  		return null;
  	}
docs: /*
  (non-Javadoc)
  @see com.socialize.networks.facebook.FacebookFacade#getAccessToken(android.content.Context)