Thank you for your comment Phillip and sorry for taking so long to reply. I have a few things that facebook has that are able to engage students in the discussion. It seems like students in high school (senior students using moodle for the first time) even though its a online collaboration but students still answer one on one on the forum. Using facebook mention is very effection where if a students reply to a teacher and mention other students name, they will be notified through facebook and email......There comments can also post to facebook for feedback from people on facebook (if necessary) she can mention an educator who are friends on facebook and that person can reply from facebook but still appear on Moodle....
I will keep doing this if this will benefit the students ....please keep in touch....
Tobias