from the wii u release thread:
we know that in 7 days (starting the 18th) 243,000 copies of NSMBU were sold
the data collected by schuelma is from the 21st November, therefore we have data for 4 days
we know for a fact that the number is not the number of posts, but the number of unique users who posted into a community
we can then say that about 1 person out 9 who purchased NSMBU connected its Wii U to the internet in the first 4 days*
that's about 10,27%
* not taking in consideration multiple users for the same copy and those users who posted into the community without having the game
So we know NSMB = 243K copies
And we know Wii U = 425K copies
So if we generalize that 1 person per 9 people post on Miiverse, with this data we can extrapolate very, very rough sales information:
1. Nintendoland- 28,509 = 256.6K copies
2. NSMB U- 24,970 = 224.7K copies
3. ZombiU- 11,511 = 103.6K copies
4. CoD: BO2- 6,066 = 54.6K copies
5. AC3- 3,282 = 29.5K copies
6. Scribblenauts- 3,049 = 27.4K copies
7. Sonic Racing- 2,812 = 25.3K copies
8. Batman: AC- 2,437 = 21.9K copies
9. Ninja Gaiden 3- 1,931 = 17.4K copies
10. Epic Mickey 2- 1,044 = 9.4K copies
This is interesting to see the relative success of how games sold on the Wii U.