User Roles — Support —

Author – can write, upload photos to, edit, and publish their own posts.
Contributor – has no publishing or uploading capability, but can write and edit their own posts until they are published
Follower (public sites) / Viewer (private sites only) – can read and comment on posts and pages

Comments in WordPress Users must be registered and logged in to comment

Users must be registered and logged in to comment: This option will only allow registered users of your site to post comments.
Automatically close comments on articles older than _____ days: Closing comments on posts that are no longer active is a good way to limit spam comments. This option will do will allow your site to do this automatically.

WordPress Now Lets You Phone in Your Blog Posts

Automattic founder Matt Mullenweg announced the new feature for earlier today. It’s rather simple: enable “Post by Voice” in your dashboard and you will receive a phone number and a unique code for posting audio from your phone to your blog. You can post up to one hour of audio at a time.