MARTA's been doing just about everything possible to improve its image and usability. From WiFi to more trains to clean bathrooms, Keith Parker is pushing hard for a spiffed-up system that will draw new users and better engage the public. While the MARTA marketing department has been dabbling in social media for ages — think Myspace old — a recent push on platforms like Instagram has resulted in some good attention. Blogger Candler Vinson dug in to learn more about the guy behind the MARTA lens. For starters, he lives downtown, doesn't own a car and knows virtually every MARTA bus and train route by heart.