To non-mahram showing your awrah is,not allowed. Whether it be facebook, skype etc the rule is same.
Read the whole context Surah (the wives of Prophet Muhummad (pbuh) are the benchmark for any Muslimah) and note the end verse especially:
30 O wives of the Prophet! Whoever of you commits an open illegal sexual intercourse, the torment for her will be doubled, and that is ever easy for Allah.
31 And whosoever of you is obedient to Allah and His Messenger (صلى الله عليه وسلم), and does righteous good deeds, We shall give her, her reward twice over, and We have prepared for her Rizq Karim (a noble provision - Paradise).
32 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) should be moved with desire, but speak in an honourable manner.
33 And stay in your houses, and do not display yourselves like that of the times of ignorance, and perform As-Salat (Iqamat-as-Salat), and give Zakat and obey Allah and His Messenger. Allah wishes only to remove Ar-Rijs (evil deeds and sins) from you, O members of the family (of the Prophet صلى الله عليه وسلم), and to purify you with a thorough purification.
34 And remember (O you the members of the Prophet's family, the Graces of your Lord), that which is recited in your houses of the Verses of Allah and Al-Hikmah (i.e. Prophet's Sunnah - legal ways, so give your thanks to Allah and glorify His Praises for this Qur'an and the Sunnah ). Verily, Allah is Ever Most Courteous, Well-Acquainted with all things.
35 Verily, the Muslims (those who submit to Allah in Islam) men and women, the believers men and women (who believe in Islamic Monotheism), the men and the women who are obedient (to Allah), the men and women who are truthful (in their speech and deeds), the men and the women who are patient (in performing all the duties which Allah has ordered and in abstaining from all that Allah has forbidden), the men and the women who are humble (before their Lord - Allah), the men and the women who give Sadaqat (i.e. Zakat, and alms), the men and the women who observe Saum (fast) (the obligatory fasting during the month of Ramadan, and the optional Nawafil fasting), the men and the women who guard their chastity (from illegal sexual acts) and the men and the women who remember Allah much with their hearts and tongues Allah has prepared for them forgiveness and a great reward (i.e. Paradise).
36 It is not for a believer, man or woman, when Allah and His Messenger have decreed a matter that they should have any option in their decision. And whoever disobeys Allah and His Messenger, he has indeed strayed into a plain error.