[emmett]

It's not a boycott, just a dismissible nag message. Did you read the article?

Also, the number of people from these startups is approximately (data from quantcast):

4.1 million (jtv us) + 1.3 million (weebly us) + 1.7 million (reddit us) + 1.3 million (posterous) + 0.5 million (disqus us) = 8.9 million US people. Global reach is probably 2-3x that much, but quantcast doesn't offer global numbers for all of them (JTV has 26 million globally).

I'd say that counts as an established user base.

[Jem]

Perhaps I'm misreading your analysis but it seems to me you're suggesting that the US visitor count for each of those sites is 8.9 million people total? I would suggest it's actually much lower - the chances are that the people who use reddit are the same sorts of people that use posterous and disqus (and so on). You're potentially counting 1 person who uses all 5 sites as 5 separate people.

The problem I see is that - particularly for reddit, posterous and disqus - the audience is mostly technical (or at least fairly Internet literate). These are not the types of people who need to warned about IE6.