Snoop Dogg was asked how much marijuana he has smoked in his life. (“how big is mt rushmore?” he replied.) Seth Rogen was asked if had luck with the ladies in high school. (“No,” he said.)

And last week, the creators of “Sharknado,” the made-for-TV disaster movie about man-eating storms, were asked whether the script was based on a true story. (Yes, the director said in so many words.)

The interviews didn’t take place on “Good Morning America,” Oprah’s couch or on a red carpet. It happened on Reddit’s Ask Me Anything, an unmoderated online forum that has become a new tour stop for celebrities.

In recent weeks, John Malkovich, Adrian Grenier, Bryan Cranston, Christopher Guest, Ethan Hawke, Bill Nye and Ellen Page, along with members of the band the Bare Naked Ladies, have subjected themselves to Ask Me Anything, where users can ask their subjects anything, like how to deal with balding (Louis C. K.), their worse fear (Stephen King) or their favorite breakfast (Psy).