If you want to talk to ownCloud users, contributors and fans, join the community conversation over social media, the forums and other places. Most of our contributors are active on central.owncloud.org . Some are active in the ownCloud development IRC channel on freenode.net, also accessible via webchat. If you are looking for answers to questions, see the ownCloud FAQ and our support page.
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For reporting vulnerabilities, read Security.
Note that, unfortunately, most of our contributors have not (yet) set up a blog and and added themselves here. You can find a much more complete list of past and present ownCloud contributors on github, which is where we develop ownCloud.