Actually quite a few systems have been! Besdies telco stuff, Facebook used it quite a bit and I'm told it was in LinkedIn's stack as well. I get a lot of recru

Actually quite a few systems have been! Besdies telco stuff, Facebook used it quite a bit and I'm told it was in LinkedIn's stack as well. I get a lot of recruiting interest from my time at Powerset as an erlang engineer, from the most surprising places. Game companies come up a lot.