Mansi Shah is the head of social media at a digital marketing agency. She was around when Facebook and Twitter were mere infants and tears up at the thought of how grown up they are with IPOs and everything. She knew Pinterest when it was a glint in the developer’s eye. Okay, not really. But she did start off on all platforms with enthusiasm but then has a day job which she can’t do justice to if she keeps Instagramming pictures of her feet at exotic locations. She lets her 140-character side loose @Mansimusing.