The mobile version has a leaderboard, but the online version doesn't
By online version, if you mean the GC website, you may have to add it. There is an Icon with 3 horiz lines on the upper left, select "connections" and then add to dashboard. The web dashboard starts with a basic set of widgets, but you can add more, even multiple pages. (the Leaderboard is for "Connections"), though there are also leaderboards for Groups (add the groups widget to your dashboard in the same way)
