public static void addChildsToNanoPostsInList(ArrayList<NanoPost> npList) {
        for (NanoPost np : npList) {
            np.getChilds().clear();
            
            for (NanoPost npp : npList) {
                if (np.isParentOf(npp)) {
                    np.addChild(npp);
                }
            }
            
            // Sort childs by timestamp
            sortNanoPostsChildsByTimestamp(np);
        }       
    }