He has a point... there is something fascinating or daring about hooking up with old flames through the internet... or meeting new and interesting people. The internet definitely makes it easier.
BUT.... why not just tell people to exercise a bit of self control and discipline. After all... isn't discipline needed in all areas of life? Eating, Driving, Drinking, Sport, Hobbies, Etc.
So instead of getting rid of the temptation... learn to discipline yourself in the face of temptation. That is kinda what life and growing up is all about.
and before somebody quotes the old "if your right hand offends you, cut it off" .... Jesus didn't say to delete your FB account... he said "cut your hand off" ... in other words... you deal with yourself personally and directly and leave the rest of the world alone (meaning you can never completely remove all the temptations in this life).