WHEN THE REPUBLICAN presidential candidates took the stage back in August for the first Republican debate, the most talked about political topics on Facebook in the U.S. were racial issues, Mexico, the economy, LGBT issues, and immigration, in that order. Just two months later, that list looks almost entirely different.

As the Democratic candidates prepare to face off for their first debate tonight, religion and guns top Facebook’s ranking of popular political topics, followed by the economy, homeland security and terrorism, and racial issues. Mexico, LGBT issues, and immigration have dropped out of the top five altogether. more…