Amazon.com and Google have been codependent for two decades. Their respective ad businesses were destined to inters. : Google is becoming more like Amazon.com. Meanwhile, the online retailer — which is Google’s biggest ad buyer — is embracing an advertising model. That’s according to a leading internet analyst. Every year, investors eagerly await Mary Meeker’s Internet Trends presentation. She’s a partner at Silicon Valley venture capital firm Kleiner Perkins. Many say she is the top expert in this field.