@Gargron I can see people are unwilling to leave that other site because they have such a large reach. Most everyone I follow there are climate scientists of which a few created accounts here but then abandoned them. I don't think they will jump ship over there until they can reach as many here.
@MichaelBishop @Gargron reach and interaction is very different. Twitter may have better 'legacy' reach but my experience here is better interaction.