// returns count of webs actually posted
static int postSoftwareMadeWebs(Collection<Web> webs) {
  int count = 0;
  Set<S> md5s = mapToHashSet(f web_contentsMD5, websMadeByThisProgram());
  for (Web web : webs)
    if (!md5s.contains(web_contentsMD5(web))) {
      postSoftwareMadeWeb(web);
      ++count;
    }
  markWebsPosted();
  ret count;
}