Cotton Delo is Advertising Ageâ€™s San Francisco bureau chief and covers digital media and technology. She reports on social-media companies like Facebook and Twitter, especially their product roadmap and pursuit of brand dollars. Before coming to Ad Age she was an editor at AOL and had previously worked at Patch, which she joined when it was a stealth-mode startup. She has a B.A. in English from Yale. Follow her on Twitter at @cottondelo.