Tweets are presented all the time in articles as expression of legitimate opinion
What is it about tweets that would mean they're not legitimate expressions of opinion? People write them, and publish them, and it'd be a bit unreasonable to assume they have some motive other that stating their opinion, so I don't really understand why you think tweets are something else.
What is it about tweets that would mean they're not legitimate expressions of opinion? People write them, and publish them, and it'd be a bit unreasonable to assume they have some motive other that stating their opinion, so I don't really understand why you think tweets are something else.