If you’re signed up for Google Sitemaps (aka Webmaster Console) you can now see backlinks to your website.  This is useful as backlinks are SEO mana from heaven and you can spy on whether your marketing is having any effect.  I took a quick glance at mine and while the overwhelming majority are either download sites or spam blogs (they search for bingo related keywords and link to them with the hope of getting Google to rank their casino site — I hate this), I can see a few mentions from actual customers or people who find my site useful.  The Dolch sight word list, for example, got linked to by an elementary school.