Gonna add some features to Memo++ that I think will help against trolls and imposter accounts.
Flagging was the best idea so far. Unique names is not viable option.
Yep, this was what I had in mind. You can flag users as "verified", but it only appears clientside. Also user tags like RES.
Downtipping.
Gamifying this or not, a downtip with a limited and measured effect will do.