http://www.sciencemag.org/news/2018/08/scientists-do-you-want-succeed-twitter-here-s-how-many-followers-you-need

Some scientists have started Twitter accounts to share their findings with the public, but does this form of outreach succeed?

To find out, two scholars examined who followed the Twitter accounts of 110 academic ecologists and evolutionary biologists—largely in the United States and the United Kingdom—who tweet mostly about science, rather than personal matters. For example, an evolutionary biomechanist tweeted a video of a leaping crocodile, and a corals expert answered a question about bleaching caused by climate change.