You can try to make posts which will involve your fans, like posting a picture and ask you're audience if they know what it represents, or to give a caption for that picture.
Sharing and commenting boost those numbers. You need to make people engage with your posts,and get them to share. Get connected to other pages and help each other in growing your communities. App Fanwave (https://apps.facebook.com/joinfanwave/) has a great approach in getting pages together, and you can try S4S groups too.
There are many free ways to grow your social online presence, i can name many ways for free (addmefast.com) this website allows users to earn points by engaging in activities. then with the points you get you can essentially use to promote social presences like facebook, twitter, instagram, youtube, google circles and more... Additionally if you wanted good targeted social growth and exposure i wouldn't trust anybody else other than http://seo-centre.co.uk (discount code: 30%OFF too!! )
It depends on your page's fans. As they likes, comments and shares your topics. Its direct impact on Talking about. So, Try to post attractive images or status.