In November 2012 and 2013, Rock the Vote experimented with Facebook ads to encourage voter turnout by telling people the number of days remaining until the election and which of their friends "liked" the countdown. The ads were shown to over 400,000 adults, randomly selected from a base over 800,000. Rock the Vote had helped many of them register. The ads did not increase turnout in the experimental group, compared to the control group who did not get the ads. In 2012 they also experimented with text message reminders to 180,000 people who had provided their mobile numbers. Texts the day before the election raised turnout six tenths of a percentage point, while texts on election day lowered turnout.