I would differentiate between the journalist on social media versus the individual who is on social media and who doesn't necessarily follow journalistic practices. I think there's a significant variation in the level of trust that someone reading social media will have. It depends on whether the person is an original source with a journalistic background, or an original source from Joe on the street who sees something happening. They each have varying degrees of credibility.
On May 17th, 2016. See this statement in context.