Simple point-based loyalty game

We are a real estate team looking to reward our clients for acting as our brand ambassadors. We're looking to create a simple game wherein we can award points to users who complete certain tasks. The points are redeemable for prizes, and the more they've earned, the more entries into a year-end giveaway they will earn as well. Those entries would not be spent, only the points. (So imagine a bar on a graph that gets taller, with a "meter" inside that would go down as points are spent.) Users would have an avatar, and there would be a social leaderboard where each user can see how the competition is stacking up. This would be a simple bar graph where the first 5 or so players are highlighted. There would also be a "catalog" of rewards they can spend their points on. Would want it to be run through our pre-existing Wordpress site, and for the game to have social media integration, so that they could automatically import their FB profile pic as their avatar. We'd like simple animations that play when users take move up in rank, earn points, etc.