Is a conditional talaaq ('if you do this you are divorced') valid?

“A.The statement, “if you call, message or contact him (ex-husband) through social media, you are divorced” of a husband to his wife constitutes a conditional divorce (At-Talaaqul Muallaq).”

“If after the second talaaq (which was given through text message) your husband revoked the talaaq and took you back in the nikaah, you will still be his wife provided he revoked the talaaq while you were still in iddat. However, if you return to the UK, the suspended talaaqs will take effect.”

“Yes, the bride may attach such a condition at the time of Nikah. She may state that if her husband remarries then she is divorced, so this will be a conditional Talaaq if he agrees to it. If he remarries then his first wife will be divorced.”

“If Talaaq takes place, then it is Waajib for the ex-husband to provide his ex-wife with maintenance during her Iddah period provided that his ex-wife was not a “Naashizah” ( a woman who abandoned the matrimonial home out of her own free will).”