Hacker News Reader

"at all" is probably not that likely, at least in the programming sector, but "not well enough to blog" is pretty common. Heck, it's common enough amongst native speaking bloggers...

At least in game development, some of the heads of some of the Japanese companies (Nintendo, Sony, etc) struggle a lot with English.

Georgy Adelson-Velsky, who invented AVL trees and bitboards for chess software, spoke no English. (See https://chessprogramming.wikispaces.com/Georgy+Adelson-Velsk... for how he spoke no English.)

I don't know about Evgenii Landis (the "L" in "AVL"), much less the other great Russian-speaking computer scientists from the 1960s (Levenshtein? Karatsuba? Brudno?) because it's really hard to find that information, and "at all" is a very low barrier.

After all, I speak a few words of lots of languages, including "Good Morning" in Venda.

Probably everybody can read, but some would not feel comfortable talking maybe. And I also know several people who prefer to read tech news in German instead of English.

in mechanical engineering german literature is better than english.