Typically ( my postbit is heavily customized ) lol.
But here is how I have Twitter within my postbit ( we also have twit this in each post )
Ste
Code:
$post[icqicon] $post[aimicon] $post[msnicon] $post[yahooicon] $post[skypeicon]
</center>
<!-- yobromofo british expats twitter addin code-->
<if condition="is_member_of($bbuserinfo, 2, 6, 7, 5)">
<if condition="$post[field29]">
<a href="http://twitter.com/$post[field29]" target="_blank"><img class="inlineimg" src="http://www.yobromofo.com/forum/styles/webpoint/statusicon/twitter.png" alt="View $post[username]'s Twitter Profile" width="16px" height="16px" border="0" /></a></if></if>
<!--end british expats twitter addin code-->