[PinkMilk]

No the above code is for individual posts, for a single link to showthread page you would need something like this:

<a href="https://twitter.com/share?url=$vboptions[bburl]/showthread.php?t=$threadinfo[threadid]&text=$thread[title]" target="_blank">Tweet</a>

This would normally be added to SHOWTHREAD template, however if you want it in a sidebar which I'm guessing is on everypage you would need to wrap it in a conditional so it only shows on a showthead page.

<if condition="THIS_SCRIPT == 'SHOWTHREAD'">
<a href="https://twitter.com/share?url=$vboptions[bburl]/showthread.php?t=$threadinfo[threadid]&text=$thread[title]" target="_blank">Tweet</a>
</if>

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Update:

Just re-read you post and sounds more like you just want a basic tweet button this would be done using:

<a href="https://twitter.com/share?url=$vboptions[bburl]/&text=$vboptions[bbtitle]" target="_blank">Tweet</a>

However it will just post your forum url and title.