By default, the author user role allows users to add, edit, and delete their own pages and posts, but disallows users to edit or delete others’ pages and posts; however, it does not, out of the box, limit users to the creation of a single page or post. If your intent is merely to allow … Read more
Self-hosted blogs use RSS for subscriptions. As far as “liking” goes, that only makes sense within the quasi-social-network environment of WordPress.com.
What I do for almost every site with multiple authors: Create a separate blog for meta discussions, for example meta.example.com. Use P2 as theme. Install Authenticator to allow access for members only. Install something like Inform about Content, so the members get an email whenever something new was posted. I probably wouldn’t do that for … Read more
This plugin does it: http://premium.wpmudev.org/project/ad-sharing (it is a paid membership site).
I’d suggest jobs.wordpress.net. It’s a job listing site for freelance WordPress development. Just be very clear that you aren’t offering any pay for the project. Alternatively, you can also suggest things in the official WordPress forums: Requests and Feedback. One third option is to mention it to someone on the WP-Hackers mailing list.
The Codex has a page on how to contribute to WordPress. Some other ways to help: Help others with questions. On the WP.org support forums, here, or on other sites, it does not matter. Pick a question that has been open for a while and try to solve it. I have a tool to quickly … Read more