Linux has, by far, the best communities of developers, designers and users. There are many different forums for the specific Linux distros such as Fedora, Linux Mint or Ubuntu. From my experience the best forums (Most Active) forums are the ones over at Ubuntu and Fedora (link in the name) with a number of professionals and amateurs alike all willing to give answers to your questions or if you need somebodies view on your site or blog.
Both Forums have the latest technology from vBulletin the industry standard for forum creation which gives many options and has various limits, rules and restrictions on the users, however if you need something deleted you can easily contact the administrators who are unbelievably active for volunteers and totally committed. Anything you ask will be swiftly answered by the whole team at Ubuntu or Fedora.
If you want to contact me on the forums my username on both is Linuxnall.