I don’t know - I have made tons of mistakes so far. I have managed to multi quote properly by selecting the text to be quoted BEFORE clicking the REPLY button. Always check the preview to see your quote will show properly. If it seems to fail, discard it and try again. Like me.
@JackieLikesVariety and @PlaceboTarget: Those quotes that came out mal-formatted:
Be aware: The [quote] and [/quote] tags MUST be on lines by themselves, and not on the same line with any other text. (This was not required at vBulletin.)
So check your preview, and if the quotes aren’t right, check your quote and /quote tags.
I think they’re still working on this aspect. On the other hand, users may be able to turn into members simply by being active (reading, posting, quoting, etc.).