Note also the correlation: startups get to choose their tools, so they usually go with cool "new" languages (yes, I'm aware that Ruby and Python are technically older than Java, and that C# is technically newer than any of the three, but here I use "new" to mean, "not the next COBOL" ;-).

Bigger, older companies tend to be more conservative, or simply have a large legacy codebase, so they tend to use Blub more often.

Languages can also stagnate and become Blub, compared to newer languages. Think of a 10-year-old dot-com-era company who used Perl 5 because it was the best thing around at the time, and now, 10 years later, has a bunch of legacy Perl code that seemed like the coolest thing ever, but somehow looks like Blub now...