I think a more productive approach is to "not" look for links to post to hacker news.

I think stories are beginning to "churn" where good stories arent sticking around very long because there are so many mediocre stories being submitted.

I post stuff that I or my friends have written, or from new stuff from communities I participate in.

while I understand submitting is a form of contribution, its only a positive contribution with high enough quality, if people sit around looking for stuff to post I cant see the quality rising.