If you want to collect all people on Facebook that has one hobby or one idea. You have two ways how can you do it.
First is you can create Facebook group or you can create Facebook fan page. They essentially do the same but when it comes to fact they are completely different. Fan page is better for celebrities and important people who want to inform their followers. Share some funny photo or promote their product. However if you want lot of feedback. Facebook group is what you want. In this time groups have much higher reach and people can freely make comments and the engage is much higher.