Answered by Sayyidi al-Ḥabīb `Umar bin Hafīẓ (may Allāh preserve him and benefit us by him).
Young men and women mix freely with each other at schools and things like Facebook make it easy for them to get to know each other. What can we do to guide them?
We can guide them by trying to strengthen the attachment of their hearts to their Lord and helping them to taste the sweetness of being close to Allāh and being connected to His Messenger. We should also teach them about those who attained truthfulness and certainty. We should give them a portion of time in which they remember Allāh and reflect upon His speech. We should teach them to reflect on the punishments that forbidden gazes or speech entail, and upon the harmful effects of such conduct on the heart and the mind and its consequences in this life and the next.