Democratic Debates, Round 3: Julián Castro-Joe Biden Clashes Light Up Twitter

The former vice president was the most-tweeted-about candidate Thursday night

No slowing down Joe ... Twitter

Julián Castro, who served as Secretary of Housing and Urban Development under former President Barack Obama, accounted for two of the three most-tweeted-about moments during the third round of Democratic presidential candidate debates Thursday night. David Cohen is editor of Adweek's Social Pro Daily.