Question-and-answer service Quora has begun rolling out verified profiles for public figures, with President Barack Obama signing up as the first user to receive a blue checkmark. Obama has taken to Quora to answer questions about the Affordable Care Act ahead of the March 31 enrollment deadline. On-boarding the president of the US has become something of a milestone for social services. Reddit, for instance, reached a turning point in 2012 when Obama participated in an AMA on the site. Alex Wu, Quora’s Head of Product Marketing and Partnerships, told TNW that Obama’s participation is a “great signal of [Quora’s] growth and our ability to keep quality high.” In addition to the President, Quora will also add verified profiles for several other notable users, including Gravity director Alfonso Cuaron, Facebook COO Sheryl Sandberg and Netflix CEO Reed Hastings, in the coming weeks.