How Did Barack Obama's Use of Social Media in His

How did Barack Obama's use of social media in his 2008 and 2012 presidential campaigns influence the campaign process for others running for public office?

A) His success with social media has not been duplicated, with many candidates opting to stick to traditional campaign methods.
B) Social media is now widely used by candidates to raise money, communicate policy proposals, and mobilize voters.
C) Candidates now use social media for information they can use in attack ads and during debates.
D) Many candidates use social media for personal reasons, but have generally not used it for professional campaign purposes.