The vast majority of students ........ arrived. has / have
My native ears only accept plural agreement there: "The vast majority of them have arrived." The Oxford English Dictionary (OED) confirms that "majority" is usually found with plural agreement when it functions as a quantifier, as here.
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .