limit recent blog post 1 per user

[MattRiddle]

The forum I work for has a module on the Front Page where it displays 5 of the most recent blog posts.

Recently, a blog poster posted 4 blog posts back-to-back, taking up the majority of the space.

I was hoping to figure out a way to display only the most recent Blog post per user. This would give the most users access to showcasing their blog posts.

I was thinking perhaps the query could be modified in the ORDER BY or LIMIT area, but I wasn't sure where. I really haven't used this type of code that much.

Any help would be very appreciated.

Thanks!

PHP Code:

<?xml version="1.0" encoding="ISO-8859-1" ?>
<moduleinfo>
    <module>
        <title>Latest Blogs</title>
        <identifier>vbblog</identifier>
        <filename>vb_blogs.php</filename>
        <inctype>php_file</inctype>
        <templatelist>adv_portal_vb_blogs</templatelist>
        <parent>0</parent>
        <colspan>0</colspan>
        <formcode />
        <useshell>1</useshell>
        <link><![CDATA[{$vbulletin->options[bburl]}/blogs/{$vbulletin->session->vars[sessionurl_q]}]]></link>
        <options>0</options>
    </module>
    <templates>
        <adv_portal_vb_blogs><![CDATA[<tr>
    <td class="alt1"><span class="smallfont">
        $spitblogs<br /></span>
    </td>
</tr>]]></adv_portal_vb_blogs>
    </templates>
    <file><![CDATA[<?php
//Latest Blogs
$latestblogs = $db->query(" 
    SELECT blogid, blog.title, blog_user.title AS blogname, comments_visible, username, dateline, userid, views, blog.state
    FROM " . TABLE_PREFIX . "blog AS blog
    LEFT JOIN " . TABLE_PREFIX . "blog_user AS blog_user ON blog_user.bloguserid=blog.userid 
    WHERE blog.state='visible'
    ORDER BY dateline DESC 
    LIMIT 5
");

$blog_count = 0;
while ($showblogs=$db->fetch_array($latestblogs)) 
{ 
    $blog_count++;
    $blog_userid = $showblogs['userid'];
    $blogid = $showblogs['blogid'];
    $blog_title = $showblogs['title'];
    $blog_views = $showblogs['views'];
    $blog_username = $showblogs['username'];
    $blog_dateline = vbdate($vbulletin->options['dateformat'], $showblogs['dateline']);
    $blog_state = $showblogs['state'];
   
    $spitblogs_title .= "<a href=\"{$vbulletin->options[bburl]}/blog.php?b=$blogid\">$blog_title</a>";
    $spitblogs_title .= "<br /> ";
    $spitblogs_views .= $blog_views;
    $spitblogs_views .= "<br /> ";
    $spitblogs_username .= "<a href=\"{$vbulletin->options[bburl]}/blog.php?u=$blog_userid\">$blog_username</a>";
    $spitblogs_username .= "<br /> ";
    $spitblogs_date .= $blog_dateline;
    $spitblogs_date .= "<br /> ";

    if ($blog_count < 5) 
    { 
        $blog_sep = "<br /><br /> ";
    }
    else
    {
        // vBadvanced Dynamics needs this 
        $blog_sep = "";
    }
    
    $spitblogs .= "<img src=\"{$stylevar[imgdir_misc]}/blog/blog_icon.gif\"> <a href=\"{$vbulletin->options[bburl]}/blog.php?b=$blogid\"><strong>$blog_title</strong></a><br />$blog_dateline by <a href=\"{$vbulletin->options[bburl]}/member.php?u=$blog_userid\">$blog_username</a><!--<br />Blog State: $blog_state--><br /><em>Viewed $blog_views times$blog_sep</em>";
}
//Latest Blogs
eval('$home["$mods[modid]"][\'content\'] = "' . fetch_template('adv_portal_vb_blogs') . '";');
?>]]></file>
</moduleinfo>

--------------- Added [DATE]1340843166[/DATE] at [TIME]1340843166[/TIME] ---------------

I think the trick is I need to embed a 2nd query inside of the current query. So it pulls the most recent entry per user, and then displays them by post date.

Any help on doing that?