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I sometimes have to write integrations with external data providers (most of them being government agencies), and they love graphql, where (IMHO) it makes a lot of sense. They provide data about some entity¹ split into X fields, your application needs maybe 20% of them, and thanks to graphql you don't have to request anything but those 20%. When loading hundreds of millions of records, it saves you from loading, parsing, and then throwing away gigabytes of unnecessary JSON.

1: one example being tax records with all associated information about tax collecting agencies and taxpayers — it's a lot of data

Facebook does not really use GraphQL in their public apps. The apps call named queries defined server side, so GraphQL is just a glorified RPC mechanism, not a query language.

GraphQL is webscale