What do I need to do about this? Its been ongoing problem since they move in next door.?

Since my friend and I has reunited because things wasn't going well. My neighbor at my apartment who I was being friends with decided to start drama and sent my friend who I reunited with an Facebook friend request this morning so she can tell that friend how horrible person i was which she did, but my friend told her i was nice person. my neighbor is white and her boyfriend is black. Ever since they moved into the bottom apartment,they have called us racist. My friend who reunited with isnt going to put up with her drama stories. she has posted rude comments on me on her Facebook status and now texting me how my family doesn't like me. I don't know if the landlord can do anything about it but i wish they would move to another apartment away from me