Don't you worry- it happens to us all, nothing personal

Just think how amazing it'll feel when you reach the magic hundred

Oh sure, the milestones have in them, their own sweet magic... and thrill that lingers for sometime
I started two FB group for our Church community, and in less than one year, we have almost 6500 + members in one and in another we have 2500 odd members, it was a great thrill to touch 1000 and then 5000 a month or two ago....
Having said that, I would like to reiterate one thing that someone said in this forum, that these numbers do have a charm of their own, but they are pale when compared to a thriving and interactive community that you can build. Better to have 100 real loyal fans, who see your vision, and who like your way, than having 5000 Mute and Dumb spectators.... infact the more the number of people, the more frustrating is the Silence.... it's only after 5000 members that the group really picked up in posts, now we have 100s of post per day....
I would suggest to Attract and Retain those loyal fans who really enjoy what you are doing, as much as you do... and somehow inspire them to comment and make it alive.... trust me, 1000, 10000's excitement will fade, but a good compliment or a generous comment will keep you motivated for weeks if not for months

all the best... sorry for the long post.