Social network and sister in Islam

It is not permissible or encouraged in Islam for a girl to put a picture of herself on Facebook or in chat rooms or on other websites, for a number of reasons:

This is contrary to covering and concealment that is enjoined upon women in the Qur’aan and Sunnah for her safety and dignity.

O you who have believed, do not enter the houses of the Prophet except when you are permitted for a meal, without awaiting its readiness. But when you are invited, then enter; and when you have eaten, disperse without seeking to remain for conversation. Indeed, that [behavior] was troubling the Prophet, and he is shy of [dismissing] you. But Allah is not shy of the truth. And when you ask [his wives] for something, ask them from behind a partition. That is purer for your hearts and their hearts.(33:53)

O Prophet, tell your wives and your daughters and the women of the believers to bring down over themselves [part] of their outer garments. That is more suitable that they will be known and not be abused. And ever is Allah Forgiving and Merciful.[al-Ahzaab 33:59]

So Allah, may He be glorified and exalted, enjoined the wives of the Prophet (blessings and peace of Allah be upon him), and the believing women in general, to observe hijab, so as to purify the hearts of the believing women and to protect them from anything that may give rise to temptation or suspicion, and so as to preserve their chastity and that of His believing slaves. Once this is understood, it will become clear that for a woman to put her picture where it will be seen by righteous and evildoers alike on such websites is something that is contrary to Allah’s and his messenger's teachings.

That opens the door to fitnah (temptation) and evil for the woman and for those who see her. How often have we heard and read painful stories caused by such things. How many pure and chaste women have fallen into the traps of those who do not fear Allah, evildoers who have tempted them with sweet words and promises until, when they had had their way with them, they turned their back on them and abandoned them with nothing but regret and loss, and perhaps collected nothing but shame in this world and in the Hereafter.

How many evildoers have tampered with those images and reproduced them by modern means, putting the head of a decent woman on the body of an immoral woman, then there will be great regret for what she brought upon herself and her family when regret is to no avail.

We do not say that it is obligatory for the woman to cover her face; then publishing pictures in the manner mentioned opens the door to women for be tempted to be a source of temptation, and for them and their pictures to be treated disrespectfully, as they will be visible to anyone who wants to see them. 

May Allah protect my sisters in Islam. Ya Allah Forgive us
And Allah knows best.
Islam is the best!