Installing Chat plugin causes fatal error – conflicting with facebook plugin

When I activate the chat plugin, I get this error:

Fatal error: Cannot redeclare class Facebook in /home/user/public_html/wp-content/plugins/wordpress-chat/lib/facebook-php-sdk/facebook.php on line 93

Apparently, these plugins are trying to use the same class and it causes the whole site to blow up until I delete either of the plugin folders. For some reason, I assumed that these two plugins would work on the same site.

Please advise..