Carolyn Penner: The Innovation 50

Head of product communications, Twitter

It has been a whirlwind 18 months for Twitter during which it embarked on – and completed – its journey to go public. As Twitter's chief spokesperson for products, Carolyn Penner informs the public about the social media service's constantly evolving product updates, which is no easy task given the rate of change and scrutiny it faces from its loyal users and now shareholders.

One big update in recent months was its new profile pages, which are more visual with larger profile and header images. Another update, which Penner hinted at recently in a tweet that was picked up by vigilant tech reporters, is a feature that enables users to add additional comment to a retweet. Working at an innovative company that is constantly in the limelight is nothing new to Penner, who joined Twitter in 2010 from Google, where she was an associate in the global communications and public affairs department for three years.

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