Once upon a time, Zosia Mamet was known for smaller roles in TV shows like "Mad Men" and movies like "The Kids Are All Right." These days, she's better known for a brilliant portrayal of Shoshanna Shapiro on HBO's "Girls" and for inspiring guest columns in Glamour magazine. In honor of the Make Your Mark contest, in collaboration with Bayer and Glamour, to inspire and celebrate women who are making their mark on the world, Mamet spoke with HuffPost TV about what makes Shoshanna tick, Lena Dunham's new book and "Sex and the City" comparisons: Can you explain more about the Make Your Mark contest? It’s really geared toward what I think is sort of the essence of Glamour, which is inspiring young women and making them feel excited and confident about the choices they’re making and what they’re doing.