Is talaq via sms valid?

The first talaq was given on dec 4, 2015 via sms. And both the husband and wife were not living together. And second talaq sms was sent to wife on jan 2, 2016. Later in feburary 2016 they got rujoo and started to live normal. Later on 7 sept 2016 husband sent talaq sms to wife again in anger while he was in another city. And after few min send another talaq message at facebook too. In next morning he regretted it that he didn't know what he was doing. he was not feeling well and had fever and he was sort of unconscious due to some medicine he took for insect sting. Is talaq via sms valid?