<img class="alignright size-full wp-image-201044" title="333" src="http://tctechcrunch.files.wordpress.com/2010/07/333.png" alt="" />Last August, we first wrote about <a href="http://www.olark.com/">O
<img src="http://tctechcrunch.files.wordpress.com/2009/08/demodayshot-1-215x160.png" width="215" height="160" />I'm here at <a href="http://www.ycombinator.com">Y Combinator's</a> Demo Day, where the
<img src="https://techcrunch.com/wp-content/uploads/2009/08/olark-logo.jpg" width="212" height="94" />
The ability to chat live with visitors is an incredibly useful marketing tool for site owners. W