I am not planning on sending out STD because most of the guest list is family and have already booked hotel rooms so I feel that it would be a waste (both environmentally and financially). I do have a few friends that would not assume that they are invited and would be coming from out of town. Would it be acceptable to send them a facebook message with the wedding website so they could check on hotel and flights if they are able to come? I know facebook wedding stuff is super tacky but I don't want to buy 100 STD but I also want them to be able to plan ahead if they can come or not.