Earlier quoted context omitted.
The blog post talks about Facebook development. Has Facebook ever released browser share numbers? I bet their target audience is a lot less than 2% IE6.
I was responding to a specific comment which suggested 2% is nothing worth caring about, not to the original blog. That said, I would think that Facebook is mainstream enough to get it's fair share of non-technical users.
I optimistically hypothesize that users are less likely to access Facebook (or most other non-internal webapps) from a locked-down corporate desktop, and even if not, that those users also access Facebook from non-corporate systems, making the loss of access from the corporate system partly illusory -- if the posited loss is "2%", I think the actual loss is probably as low as 1%.