I'm in Daegu, Korea, for this year's AoIR conference. The first paper session I'm in starts with Amy Johnson, who notes that existence on Twitter is manifested by voice – and voice is understood as the linguistic construction of social personae. Popularly, social media platforms are also described as giving people a voice, though this view is heavily disputed.
On Twitter, anyone with an email address and the technological literacy can have a voice, so from that perspective it is a surprisingly permissive environment – people, groups, bots, group of bots can all have a voice, and this makes Twitter a post-human and post-individual space.
There is a long history of research into the imagined and imaginary nature of participation, participants, and communities, of course – from Anderson to Appadurai and beyond. Amy's focus is on Twitter bot accounts as technical objects, especially also because Twitter explicitly allows and embraces such bot accounts.