Every day, Facebook manages 4.5 billion "Likes," 4.75 billion content shares, and over 300 million photo uploads. Joining the social media sites was part of the administration's efforts to meet President Obama's call to "reform our government so that it is more efficient, more transparent and more creative." As of September 8, 2011, 35 global heads of state had Twitter accounts; every U.S. federal Cabinet agency and 84 percent of state governors were active on Twitter; and more than 40 percent of global religious leaders like the Dalai Lama and the pope were on Twitter. As of September 8, 2011, 35 global heads of state had Twitter accounts; every U.S. federal Cabinet agency and 84 percent of state governors were active on Twitter; and more than 40 percent of global religious leaders like the Dalai Lama and the pope were on Twitter. Social media is now pervasive in our world with existing social networks expanding, niche social networking sites being created for educators, medical professionals and other groups, and new social media sites popping up regularly, all accessible 24 hours a day via computer, tablet, smartphone and Internet-enabled devices. Opponents of social networking say that the sites prevent face-to-face communication; waste time on frivolous activity; alter children's brains and behavior making them more prone to ADHD; expose users to predators like pedophiles and burglars; and spread false and potentially dangerous information. Proponents of social media cheer on the benefits and possible advances to society, while dissenters worry the dangers and wasted time far outweigh any benefit. Opponents of social networking say that the sites prevent face-to-face communication; waste time on frivolous activity; alter children's brains and behavior making them more prone to ADHD; expose users to predators like pedophiles and burglars; and spread false and potentially dangerous information. Two-thirds of businesses fear that social media endangers corporate security and 1 in 4 social networking site users unwittingly exposes him\/herself to crime by revealing personal details. On June 12, 2009, the White House announced via the White House Blog, that it was joining Twitter, Facebook, MySpace, YouTube and Flickr in order to "create unprecedented opportunity to connect you to your government in order to obtain information and services and to participate in policymaking. Sophomores and juniors only experienced a negative impact on their GPAs when they used Facebook while studying. On June 12, 2009, the White House announced via the White House Blog, that it was joining Twitter, Facebook, MySpace, YouTube and Flickr in order to "create unprecedented opportunity to connect you to your government in order to obtain information and services and to participate in policymaking. Opponents of social networking say that the sites prevent face-to-face communication; waste time on frivolous activity; alter children's brains and behavior making them more prone to ADHD; expose users to predators like pedophiles and burglars; and spread false and potentially dangerous information. Proponents of social networking sites say that the online communities promote increased interaction with friends and family; offer teachers, librarians and students valuable access to educational support and materials; facilitate social and political change; and disseminate useful information rapidly. Social media ad revenue is expected to reach $32.9 billion by the end of 2016, an increase of 84 percent from 2014.