[SXX]

Durov was smart enough to let community build open source clients and use them. And to make internally built clients open source.

[petu]

Most people use official clients and AFAIK they don't really accept any external contributions? All clients were fully developed by employees.

[tiagod]

That's not it. I believe all the clients were built by employees. What he did was give each client to a very small, experienced team.

[maqp]

Too bad he gave the job of company cryptography team to his brother, Nikolai who's an expert in geometry, not cryptography.