also try going through the forum post that has all the clan mates psn's, its a pain to go through and add everyone(trust me I did it), helps to use the psn app in tandem with the forum post, rather than add everyone from your ps4. Anyway, once you add everyone you should have plenty of friends online once finished, I just send out a mass message to people online saying im starting a raid and usually get at least 3 replies