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I have to disagree that an "SEO specialist" would complete any of these tasks, to be honest. Lots of this stuff is done by robots and the "SEO specialist" (ahem) takes credit for it.   ... and the webmasters who want their site to receive genuine "bookmarks" or "shares" or "listings" have content that is either so skimpy or so bad that they don't need an SEO specialist.... they need a magician. Create ten pieces of unique content for specific audiences .... with the intention of having that content appeal to the user-base of those audiences. If you do what Jane suggests, and do it exceptionally well, you will not need an SEO specialist or a magician because your visitors will do the bookmarking, sharing and listing for you.  Visitors to websites love to tell their friends when they find fantastic stuff.  It makes them feel like Christopher Columbus or Indiana Jones and they wanna tell their friends about their discoveries.  Also, a busybody or a gossip can be better than lots of SEO specialists.  They tell everybody everything - but this works best when you have juicy stuff to talk about.