Here are five of this week’s most interesting and important news items: 1.  Facebook Unveils First Non-Social Mobile Ad Unit, Allowing Developers To Buy Clicks To App Stores — TechCrunch reports on this new development in ad opportunities at Facebook that’s currently in a small private beta. 2.  Is Your Linkbuilding Working? How to Easily Check Using Webmaster Tools and a Pivot Chart — over at SEOmoz, this fantastic how-to clearly sets out how to check on your link building’s effectiveness, even going so far as to explain how to turn the data into a pivot chart (and not once did my eyes glaze over and the room go dark!). 3.  FTC: $22.5M Penalty To Get Google To “Take Its Privacy Obligations More Seriously” — Marketing Land has…