Hi, So, when I use Facebook on Safari on my 2015 MacBook Pro running 10.12.5, when I initially load Facebook and do a 2 finger scroll down, the screen (mainly the lower half) does a super quick flash of all of this matrix style green code with black background. I have a suspicion someone is trailing me online after someone compromised my Facebook and blocked a specific friend I have no contact with on Facebook, but Snapchat and text with frequently. But, I know it's not possible because MacOS is so secure. Any advice on this? P.S.- Yes, I am not insane and I have all my marbles in tact.