If you have both Facebook connect and Wordbook running on a 2.7 blog, you will run into issues with the Wordbook plugin (at least i did), caused by classes tried to be re declared.
Although i'm waiting for an update of the plugins, there seems to be a work around for this issue:
- add in the WordBook files an "If class_exists" statement for every class declaration
- modify the facebookapi_php5_restlib.php file in the Facebook connect package so that it contains the constants:
const STORY_SIZE_ONE_LINE = 1;
const STORY_SIZE_SHORT = 2;
const STORY_SIZE_FULL = 4;
For a complete proof of concept see here: http://www.soeloe.com/2008/12/proof-of-concept-using-wordbook-and-facebook-connect-concurrently/