They're thread-specific, so have no impact on anonymity beyond same-person. 4-ch is much less angry about the internet than you, so I don't think you would survive.
Retain your personality.
This is a problem but hey, got to ask moot about it. He makes all this stuff happen.
It worked, right? It looked better than this, right?
No (mobile phones), and no (seriously! the entirety of the elitist superstructure approved it, even the spirit of Shii from beyond the grave)
I will have to find a 2ch user and ask them why their post button is on the upper left. Perhaps then I will have insight.