Maybe I am alone, but I really do not like the leaderboard after every completed level. I'm sure I have to sell this to King, so here goes. My idea is that the leaderboard should only come up if you improve your score and or position. Here's why it benefits King. It wastes time, and time is money, . . . Right? The little informational banners boast of how many games are played and what the players swipes add up to, so imagine if all those players gained those few seconds back to play more, use more boosters, and buy more items.
I also would really love to see the map augmented to show your position among your Facebook friends. The information is already on those leaderboards for each level. It shouldn't be too much of a stretch to put a little number by each level. Again for those who go back and play completed levels to improve their position on the leaderboard, more boosters, more purchases, etc.