Praise be to Allaah.
It is haraam for a girl to put a picture of herself on Facebook or in chat rooms or on other websites, for a number of reasons:
1. [al-Ahzaab 33:53]
“O Prophet! Tell your wives and your daughters and the women of the believers to draw their cloaks (veils) all over their bodies (i.e., screen themselves completely except the eyes or one eye to see the way). That will be better, that they should be known (as free respectable women) so as not to be annoyed. And Allah is Ever OftForgiving, Most Merciful”
[al-Ahzaab 33:59]
And He forbade women to speak softly, as He says (interpretation of the meaning):
“O wives of the Prophet! You are not like any other women. If you keep your duty (to Allah), then be not soft in speech, lest he in whose heart is a disease (of hypocrisy, or evil desire for adultery, etc.) should be moved with desire, but speak in an honourable manner”
[al-Ahzaab 33:32].
2. That opens the door to fitnah (temptation) and evil for the woman and for those who see her.
Allahu Ahlam