I'm not big on typical affiliate links, but it would be cool if there was a way to share an invitation link with friends that could add you as a friend if they sign up with it (no further benefits needed as far as I'm concerned). I know some スマホ apps and games try to incentivize this stuff by giving perks if you invite a number of people and they reach a certain level, but I'm indifferent on kickbacks.
i also noticed in the (Android) app that there doesn't seem to be any way to copy your profile to share with your 友達(ともだち).
Just wondered if any of this has been considered, I invited a friend to join day and thought it would be cool to pass them a link from the app to my profile so they could add me eaiser (I know I know, going to the site in the browser and copying that way is 易しい(やさしい) but the added feature could be 便利(べんり)
It's a bit tricky to handle it when renshuu is spread across the web, Android, and iOS. It's not impossible, but to be honest, it's never been a high priority for me. I used to have them MANY years ago when renshuu was just a website, but it got much trickier when you're talking apps.
It's not automatic, but you can always get your friend code under Me > Friends, and give that to them. It makes it relatively easy to add a friend after they've signed up.