I've taught English and composition for something like 3 now (and only 6 weeks remain eeeee!! :D) and one of the things I have to lecture and drill about is audience. Write to your audience.
- Figure out what their values are as a single person, as someone part of a group (or groups), as a society/culture.
- Figure out what their expectations are.
- Understand if their attitudes towards what you're posting/creating/writing is going to be positive, neutral, or negative (and you can definitely appeal to the trolls too if you can spin it, case and point: http://www.twitch.tv/kaceytron).
It's just like a maintaining a personal blog/website with FB functions. You want to be accessible, you want to be multiple places on the web, you want to appeal to the person that prefers following someone on FB rather than Tumblr or through an RSS feed, so on. It's more about knowing who your audience is and appealing to the cosplayers.
We can go to cosplay page after cosplay page, and see what is successful for those with thousands upon thousands of likes.
So, do you separate your cosplay page from your personal page? Why or why not?