[Disasterpiece]

Yeah, this is the wrong one. you need to tell the template that it should only display the html tags if the steam id is not empty. You can do this like this:

{vb:raw template_hook.postbit_userinfo_right}
{vb:if condition="!empty($post['steamid'])"}
<div class="steamprofile" title="{vb:raw post.steamid}"></div>
{/vb:if}
<div class="imlinks">
{vb:raw post.icqicon} {vb:raw post.aimicon} {vb:raw post.msnicon} {vb:raw post.yahooicon} {vb:raw post.skypeicon}
</div>

Not tested, but should work.