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Does Persona give you enough information to link @Emyr and @user48629?
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No.
And we haven't yet wired up the IP tracking (on content creation) to fight spam... so right now I couldn't have caught the alias.
In the future I'll have some clues, but in the architecture I've erred on the side of privacy over troll/spam fighting. So it is possible to mask who you are more effectively than you could've managed with vBulletin (I had a scary level of access to data with that).
You could do that anyway.
I thought about it, and figured why prevent people doing that? It's like leaving yourself a reminder for later.