static void postSoftwareMadeWebs(Collection<Web> webs) {
  Set<S> md5s = mapToHashSet(f web_contentsMD5, websMadeByThisProgram());
  for (Web web : webs)
    if (!md5s.contains(web_contentMD5(web)))
      postSoftwareMadeWeb(web);
  markWebsPosted();
}