What has been happening in the marketing world this week? Let The Marketing Zen Group fill you in on the latest and greatest of online marketing news in our MZ Weekly News Round-Up, published every Friday! Social Media About a year after Facebook initially announced plans for a redesign of its News Feed feature, implementation of an overhaul is set to begin this week. The updated look includes font changes, prominent photos that span the entire News Feed, and other subtle stylistic improvements, such as larger buttons in certain spots. Important to note, too, is that the update will not affect ad specs, ads performance, or optimization, which a company spokesperson was quick to clarify. For Amtrak, the interface design updates to Facebook are coming just in time for their latest social media marketing campaign. It may seem odd at first, but Amtrak has a fairly prominent presence across the social media spectrum: their Facebook page has over 377,000 likes, and the #Amtrak hashtag on Instagram receives over 1,000 photos each week. This month, in honor of Austin, Texas’ SXSW festival, the company will be sending a train from Los Angeles to Austin carrying 30 entrepreneurs and digital thought leaders….