Among social networking teens, girls are more likely than boys to add comments to a friend’s picture (89% vs. 76% for boys), post messages to a friend’s page or wall (82% vs. 70%) and send a group message or bulletin (61% vs. 46%), according to Pew Internet Project. Teens ages 15-17 are more likely than younger teens to post public messages on a friend’s page or wall (82% vs. 66%) and to send private messages within the social networking system (79% vs. 56%), although younger teens are more likely to send bulletin or group messages to all of their friends at once – 63% of younger teens have done this, compared with 50% of older teens.