Why the log in? I don't trust you enough to give you all of my information. Let me play with it first then ask me to sign in after we trust each other.
I remember this (the trolling issue) was a slight problem when SiteChat[1] was submitted to HN. However, it does add to the sign-up friction, so I'm not sure if the trade-off is worth it or not.
Yeah - we'll need to figure this out. When we posted to r/chrome last week, this was the same comment we got. Then again, we haven't heard this feedback from the, I guess, "non-technical" folks that's been using it... but we will think about this some more for sure.