Marking a forum thread as read?
<p>I'm working on a custom forum and was wondering what people would consider as the best approach to marking a thread as read.</p>

<p>I want to display a post icon for the threads and if the thread hasn't been read it has an unread icon and the topic title is bold. If its been read then the topic title is normal font weight and the post icon changes to the read icon.</p>

<p>Would the best way be to store in the users session which threads they have viewed and set it up to mark all threads older than 48 hours or so as read?</p>

<p>Thanks!</p>
