I see what you mean, but what about using YouTube to advertise Jagzone? The official facebook account posts snippets of interviews inviting people to see the full thing on Jagzone. It wouldn't take long to upload this on an official YouTube account.
Similarly, now I don't used snapchat as I don't get it, but could the club also share images that are shared on facebook like the doolan 100, or matchday Posters to subscribers somehow? I really don't know what this would add different to Twitter, but it is a cheap way of advertising to young people who are now often looking at facebook and twitter as outdated.