Check out: https://signup.hive.io/ - afik @roelandp is updating this website and it shows all the ways to join and what the 'costs' are (sometimes just an e-mailadress). For example @pharesim's hiveinvite is super useful, here community members can donate their 'claimed accounts' for others to sign up with :-) https://hiveinvite.com/public.html You could even use your own RC's via https://hiveinvite.com/ to invite your friend yourself with the requirements you want that friend to sign up with.
Go get a new person on Hive! :D Cheers :-)
Thanks so much Rosanne, the hiveinvite definitely looks interesting and I've given my friend that URL to test out. I know she's definitely got Twitter and I'd be surprised if she didn't have Facebook as well.
I'm so pleased with the range of responses here. I was so expecting this post to be totally ignored, this has been great. Thank you!