He isn't disagreeing with what seems like a generally accept notion, he's disagreeing with the presentation of the data and the conclusion reached in the article.

It only consists of many geo-tagged tweets on mobile devices from many users. There are a lot of variables here without any form of control. It is a neat experiment, but you are not able to verifiably determine any kind of numbers from these maps.

Perhaps maybe there are the same number of Android phones and iPhone (and Blackberry, etc), but the iPhone users tweet 50x more - does this map take it into account? We don't know either way. What phone are they using? Maybe a lot of people in Washington are using Samsung S3s, which aren't cheap Android phones.

Bottom line, you provided nothing to the discussion other than a quick Google search without considering the many variables obfuscated within the map.