Copied from http://ashtender.com/gems :
There’s a new leaderboard available today, the Invasion Leaderboard. This leaderboard shows who has invaded the most times, and what troop they prefer. There are also PlayStation 4 and Xbox One versions for those of you on those platforms.
As a reminder, to participate in any of the leaderboards, you will need to opt in via your Account page. Only one opt-in is required to participate in any of the leaderboards.
Visit your My Collection page to update your numbers when you deem it appropriate.