It almost goes without saying, but it’s important to always be sharing interesting content on your Facebook Page, and always using all available descriptive fields on each type of content shared. When posting photos, use verbose and keyword-dense descriptions. When posting events, take the extra minute to include text and keywords in the event description field that you want to rank for. Add a discussion forum to your Page.
Facebook makes all of the content shared on Facebook Pages indexable by search engines, so use the tools Facebook provides to your full advantage.