code: public static boolean onMessage(Context context, Intent intent) {
  		assertInitialized(context);
  		
  		Bundle messageData = intent.getExtras();
  		
  		if(messageData != null) {
  			String source = messageData.getString(C2DMCallback.SOURCE_KEY);
  			if(source != null && source.trim().equalsIgnoreCase(C2DMCallback.SOURCE_SOCIALIZE)) {
  				handler.onMessage(context, intent);
  				return true;
  			}
  		}
  
  		return false;		
  	}
docs: Handles a GCM message.  Returns true ONLY if this message was intended for Socialize.
  @param context
  @param intent
  @return