In the "Networks and Imports" section, Nimble shows "import contacts" on accounts for which I have already imported contacts. That makes it confusing because it is unclear whether contacts have already been imported.

I would suggest it show "re-import contacts" on accounts that have already imported, and show a "last synced on [date]" message next to it. Better yet, it would be helpful to have regular syncing taking place behind the scenes natively (without some 3rd party sign up).