If your evidence for war crimes is Twitter, there's a problem. And the problem is not Twitter.
Twitter and Facebook posts should not be evidence of anything. That stuff is so easily faked that courts would be entirely right to laugh such "evidence" out of the courtroom.
Evidence should be gathered by appropriate authorities and kept in accordance with international standards on evidence storage.
If your evidence for war crimes is Twitter, there's a problem. And the problem is not Twitter.
Twitter and Facebook posts should not be evidence of anything. That stuff is so easily faked that courts would be entirely right to laugh such "evidence" out of the courtroom.
Evidence should be gathered by appropriate authorities and kept in accordance with international standards on evidence storage.
Hint: That's not "look at this tweet I got!"