This is kind of a difficult one to think of! Recently, I ported a stranger from one Bree-land to East Angmar on LOTRO, which I felt pretty good about since it can take ages getting there by horse or on foot. I've also offered to help my kinship with taking stock if they need it.
As for other fannish stuff, I try to leave reviews on fanfic, even if they're only short reviews.
None of that was done for the challenge, but I figure it meets the criteria all the same.