title: backlink search sources
body: <p>Which methods i can use to find backlinks on my site?
  for example i can search in google "<a href="http://stackoverflow.com">http://stackoverflow.com</a>" -site:<a href="http://stackoverflow.com">http://stackoverflow.com</a>
  all resulted pages can contain backlinks, i must parse all them to check it.
  What other good methods exists?</p>