A packaging change by PepsiCo(NYSE:PEP) illustrates social media's growing influence on corporate marketing.In January Pepsi introduced a new label on its Tropicana Pure Premium Orange Juice cartons. Gone was the traditional straw-in-an-orange logo of 24 years.It was replaced with a glass of juice. How did customers react?Pepsi's about face with Tropicana is quite a contrast from the obstinate stance they took on the 8-Pack. Our original post about Pepsi's decision to phase-out the 12-pack and replace it with 8-packs received over 25,000 views and made it to Fark.com. Full story...