An "open" social media account can be viewed by anybody. I understand that the laws of the UK and other countries too extend to social media and users of such platforms can be prosecuted for posts which are defamatory or harmful in some way.
But what about comments made on posts by other users? If I were to post a perfectly acceptable photo on an open Instagram account, for example, and someone else using their own account added a comment to my original post which contained something defamatory or otherwise litigious against another party (not myself), can I, as the owner of the original post, be held accountable for that? If the police were to investigate the source of the comment, could they force me to delete a comment made by someone else from their own account but is attached to my original post?
I appreciate you might ask why would you not want to delete a defamatory comment from your post? Well, sometimes we may support the reason behind something but not the actual action taken. For example, thousands of people might be willing to sign a petition against something, but only a small subset of those might be willing to actively protest against it, and when a protest crosses the line between acceptable protest and illegal protest some might tacitly support what an individual or group did even though they would not do it themselves. Likewise, if somebody made a comment that I agree with in principle but would not have said myself, I would feel hypocritical deleting it, but I do not want to risk prosecution myself and so am interested to know where a person would stand in such a situation.