Currently active large companies are highly likely to have official pages. Among individuals, currently living celebrities in movies and music are highly likely to have official pages.
[header] How to gauge the popularity of a topic online [title] Identify a canonical (preferably official) facebook page associated with the topic where applicable. [substeps] Entities that correspond to living persons or active brands, companies or other kinds of organizations are likely to have official pages. For an official page, you'll see a blue check mark (specifically, white check mark with a blue background) at the end of the name.