Off topic, but some of you probably run clan or community servers.
I help run a chat server for a small FPS clan and its friends, around 350 members. Most of the active people were brought in by a few regulars who keep inviting friends and then teach them the maps.
We wanted to reward those people with a role, but the invite numbers were full of accounts that joined for a minute and disappeared.
We switched to a tracker that filters out fake joins and people who leave, and the list finally matched who actually shows up for matches.
Does your clan or community track this, or is it overkill for a small group?