The Official Graduate School page is https://www.facebook.com/UPLBGradSch/ . Information for the general public are usually posted there.
The Official UPLB Graduate Student’s Group is https://www.facebook.com/groups/UPLBGradStudents/, a closed group for bonafide UPLB-GS Students only. Announcements and other useful information aimed for students are posted there. All GS students are encouraged to join the group.