What is the ruling of Islamic law regarding a married woman conversing with a male colleague who is a stranger to her via social media, in a manner that includes flirtation and romantic talk?

A married woman's conversation with a foreign man in matters of flirtation is a reprehensible act and a source of corruption. She must take the initiative to repent to Allah by immediately severing this relationship, abandoning the sin, regretting her action, resolving not to return to it, avoiding the causes of disobedience, and cutting off all paths leading to it. She must also beware of Satan's attempts to discourage and despair her from repentance. Furthermore, she should know that a woman's work in a place where she mixes with men is a gateway to evil and corruption.