bp_blogs_blog_user_id_before_save
apply_filters( 'bp_blogs_blog_user_id_before_save', $this->user_id, $this->id )
API Hooks: BuddyPress:: File: bp-blogsbp-blogs-classes-php (2)
bp_blogs_blog_id_before_save
apply_filters( 'bp_blogs_blog_id_before_save', $this->blog_id, $this->id )