I didn't downvote you, but I'm not aware of any "network" (by which I assume you mean website or application) that matches the requirements you set. Open source websites simply don't exist - as it's impossible to actually validate that the code running on a server matches whatever source code a company might distribute, and every site and application attempts to limit or control access to your data in some way.

Hacker News itself explicitly doesn't share their fork of the Arc forums, and don't allow raw access to your data.