Okay, now that the next Update has been released here are some infos about a feature that is not quite new, but it hasn’t been featured here because of a nasty firefox-bug:
Invite your friends to shoppero easily.

Now we can read email addresses from Gmail, Yahoo, Hotmail, Lycos, GMX web.de mail.com and AOL. We also can read Outlook, Outlook Express and Thunderbird files, as well as CSV-files.
So what happens with those email addresses? We will send an email to the selected users and inform them about the shopperoaccount of the sender. The email has a premade text or some custom text you write. Then we forget about the users again. So no spam, no sharing, we just don’t save them.
So now it has just gotten easier to invite some friends to shoppero.