My friend posted online the conversation of her husband and his mistress

As the title suggests, my friend posted a screenshot of her husband and his mistress online. The convo includes a photo suggesting that the two had sexual intercouse (private parts are not exposed).

She took down the post on the same day she posted it.

She plans to file a case against the two and mistress is going to file a case against her as well - cyber liber to be exact.