Rolf Jacob Sartorius (born October 2, 2002) is an American social media personality and singer.

[1] At age seven, he began acting in musicals, where he discovered his love for performing.

[2] His lip-syncing videos on Vine acquired more than 8 million followers as of August 2016 before its closure in 2017.

[3] He believed social media offered him an escape from bullying, stating, "Before Musical.ly, I wasn't the most outgoing.

[6][7] In 2016, he undertook the All My Friends Tour, a solo mini-tour where he performed in six cities.