This screenshot of a NASA tweet is fake
Now imagine someone deletes all their old tweets programmatically. Several people have screenshots of an "old" tweet as they allegedly saw and "saved". Who do you believe?
https://screenshotscdn.firefoxusercontent.com/images/22ea282...
In Chrome: right-click, inspect. Edit page source. Done. Less than two minutes, and you don't need to have a tech background to do it.
Never trust screenshots.