Fedi.Tips@FediTips@social.growyourown.services
If you're helping people sign up on here, that's great! 👏
However, I'd strongly suggest not signing up on the mastodon.social server. It's way way too large and that's dangerous (here's why https://fedi.tips/its-a-really-bad-idea-to-join-a-big-server).
I know some find choice overwhelming, so if you just want one general long-established very busy server https://mas.to is a better option for example.
There are also lots of other good servers listed at https://fedi.garden and https://joinmastodon.org/servers
staringatclouds@staringatclouds@mstdn.social
@FediTips@social.growyourown.services You can invite people to join & then they join whichever instance you're on