Yes, if they are registered users who are logged into the system, and
if you have given them permission. There are three user levels which
have this power:<br />
<ul>
  <li>Author - This group allows a user to post content, usually via a link in the User Menu.</li>
  <li>Editor - This group allows a user to post and edit any content item from the Front-end.</li>
  <li>Publisher - This group allows a user to post, edit and publish any content item from the Front-end.</li>
</ul>