Typically, a sit-down with the president is an honor reserved for only the most senior and respected White House reporters. But at 5 PM, President Obama will continue his administration's practice of working with new media by agreeing to take questions from some unusual interviewers.Think of it as a teeny-bopper AMA, or at least a more fun version of Tuesday's State of the Union address. Three YouTube stars will be grilling the president, and they're not exactly known for their hard-hitting insight into domestic affairs.The interviewers will be GloZell Green, who's perhaps best known for sitting in a tub full of cereal; a 19-year-old who gives beauty advice named Bethany Mota; and Hank Green, a notorious YouTube ranter whose brother wrote The Fault in Our Stars.