James Van Der Beek 'CSI: Cyber' Schooled Me ... On Hacking

5/6/2015 12:40 AM PDT

James Van Der Beek -- 'CSI Cyber' Schooled Me On Hacking (VIDEO)

EXCLUSIVE

"CSI: Cyber" has turned James Van Der Beek into a full-fledged cyber-geek ... and he knows exactly how to keep your online info on lockdown.

Our photog tested the actor to see if he'd learned any tips as Agent Elijah Mundo on how people could protect their Facebook info ... and gotta say, he really surprised us with some deep knowledge.

He's impressive ... think about what he says before you start posting selfies.

#beekhacks