done - but it's also a more generic question for other sites. I remember when (maybe they still do) sites like facebook would ask for email name and password and then login to your email to get address of people to invite. I just moved to Dynalist from Workflowy and they have a option to import your workflowy data - you give your login username/password and it does it for you. etc.

I'm interested in it for hackernews - but I'm also interested if there are other guidelines/rules/examples for this kind of process in general.