SEO and SEM are in play when you think of Google+ and how it could impact search results for users. When people +1 an item on Google now, it can show up in your Google+ stream. It can also show up to your friends as a site that you like. What does it all mean?
Will the +1 metric really impact search rankings, or will it simply impact your network? How will Facebook Likes impact search ranking, and will Google even know if you Like a Facebook page since they don't have a close relationship with them?