A guy gave himself a Harvard MBA on LinkedIn as a joke and the DMs rolled in complimenting his impressive academic background. The wild part is that verifying a degree costs $19.95 and takes about two minutes. LinkedIn just has no reason to run the check. The National Student Clearinghouse holds degree records from 3,600 colleges covering 97% of US enrollment, Harvard included. Employers can query it online, 24/7, and get an answer back almost instantly. Background check firms hit it millions…