I've seen several companies use stackoverflow in this manner - appharbor and the google maps team to name just two.
Obviously, these are for technical problems using a public service - user account issues aren't really appropriate though.
Obviously, these are for technical problems using a public service - user account issues aren't really appropriate though.
However, you are right, stackoverflow is not for the type of issues we are talking about, like "I cant login", "This form gives me an internal server error with this input" etc...