Any means of meeting, exchanging or sharing is lawful as long as it does not violate the values of morality (respect, modesty...) and does not transgress the limits set by our faith. 

Allah, may He be exalted, says in the Noble Qur'an: "O you men, we created you from a man and a woman and made you different peoples and tribes so that you may know each other" S.49 V13. In another verse He says: "Help one another in goodness and piety, not in sin and transgression" S.5 V2. 

Our Master the Prophet, peace and salvation be upon him, says: "The believers are like a wall, one solidifies the other. "(Bukhari).