My experience of Twitter is that the impression one gets of its nature, for example whether there is a particular faction behaving in a particular way, is very much dependent on where you go and who you follow but also what you regard as appropriate or excessive. Personally, I have never noticed that I am not followed back; if anything I am the guilty party when I simply forget.
I do agree that we could do with more resources in the UK around what agents are looking for. I don’t suppose it would impact on my subject matter or way of writing to be honest, but it would help those who are more commercially minded, and it would also help everybody looking for representation. There is Agentmatch (formerly Agent Hunter) from Jericho Writers, but this is only available with a JW subscription, which isn’t cheap.