Whether it’s Facebook posts and comments, Instagram pictures, Twitter tweets or YouTube videos, the short answer is yes: both public and private social media content can be admissible in litigation. Screenshots of digital messages are regularly served as evidence in criminal cases, usually to support allegations like harassment and malicious communications. However, they can appear in any case where digital messages are capable of supporting the prosecution case.
Yes, the Facebook messages may be admissible in court since they are relevant, but there are other hurdles you will have to overcome as well. The rules of evidence govern what can and can not be introduced in court.
There’s nothing illegal about assuming anything. You can screenshot anything you like on Facebook and share it however you like assuming that anything you’re screenshotting is legal to have and store digitally anyway. You can show anything you like to strangers so long as you’re not harassing them.
If they are fake you first challenge the veracity of it. He will have to provide certification to authenticate electronic evidence.Few screenshots anyway alone cannot prove extra marital affair ,secondly even if true does not give him a right to be violent towards you. Social Media evidences can be taken into consideration, subject to the fulfilment of the guidelines issued under Section 65B of the Evidence Act. Your husband will have to satisfy the Court regarding the genuineness of his claim.