I just blogged about the ESME / OFBiz integration: http://blog.esme.us/integration-with-apache-ofbiz/
I added an service that responded to the creation of new facilitites by creating ESME messages. Code is in the wiki: http://cwiki.apache.org/ESME/simple-use-case-ofbiz-sends-message-to-esme.html I picked the Facility entity but I could just have easily selected something else (Product, etc.) You could use same code to integrate Twitter into OFBiz. Just change the URL to point to Twitter instead of the local ESME instance. D.
