I share most of my insights in my articles here on DEV, so I'd recommend through my profile.
In-house, we use Phabricator Ponder (which functions like a mini-StackOverflow) for asking and answering questions. I try to encourage interns to use that instead of email when they have a question, so the answers are available to other (and future) interns. There's not as much information on there as I'd like, but we're working on it.
We also maintain extensive documentation of our processes and workflows, including detailed setup and debugging instructions.
We're a place where coders share, stay up-to-date and grow their careers.
We strive for transparency and don't collect excess data.