[mhd]

Yes, you probably have a fragmentation of topics, i.e. the startup stuff will be posted on the European site, but the "hacker" articles of general interest will be posted and discussed here. Which seriously restricts the user base and thus the helpful answers on the Euro site.

I could imagine something that works, if you're willing to fragment even further and make language-specific sites, as this way you could post articles in languages other than English and you'd get discussions from those users who don't feel that comfortable in English. But that further restricts your user base. Might work for French and German, but beyond that? (Spanish, too, of course, but then you'll run into problems with the country/law specific stuff)