stalkscan.com
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stalkscan.com was a Facebook searching service which let you find all 'public' data for any user, including content not in Facebook's export. The service was last available in early 2020 (archive), then the domain was put up for sale, and eventually went offline.
Features
StalkScan provided data with much deeper granularity than Facebook itself provided.
Originally, data on all accounts was available via the Graph Search API, but after 2019-06-06, it only provided a user's own account data. StalkScan was useful to access content for PESOS such as your comments on other posts that was not available in the Facebook export.