This one is, apparently, still over 1000 followers away. I'm not on Twitter and have no interest in joining it. Aren't there a lot more people on Facebook than on Twitter? (I could also be totally wrong here.)
I just have mixed feelings about "Social Media" goals. I don't like feeling like I have to sign up for a service I don't want just to get additional game content. I'm hoping that if this one falls short of its goal that the designers will still consider giving players the Gem item and Quest card.
I don't like them either. I just hope there's enough backers that already use those services that go for the extra click on both sites.
It always feels annoying to me, but it is unfortunately not that uncommon.