Here are the top ten from Kongregate's 'normal' version, I assume the top four cheated somehow.
username score
1 lycan001 2,000,001,492
2 Hman 1,098,915,904
3 naveentheboss 1,073,742,336
4 McPlayerTeam 1,811,492
5 shuriken457 319,858
6 Eyeballhipurina 279,228
7 Arkantos101 251,132
8 KY_Rider 249,828
9 jimdil4st 248,668
10 Reup 151,452
If you like 2048, Kongregate has a bunch of interesting
variations on the game, including this silly one where you don't even have to play...