As an AI language model, I don't have knowledge of specific third-party tools or services. However, I can provide a general description of what a "Bulk Facebook ID Finder" tool might be.

A "Bulk Facebook ID Finder" tool is likely a software program or online service designed to help users find Facebook user IDs in bulk. Facebook user IDs are unique numbers assigned to each Facebook user's profile. These IDs can be used for various purposes, such as targeting specific users in Facebook ads or conducting research on Facebook users.

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The tool may allow users to enter a list of Facebook profile URLs or names and then extract the corresponding Facebook user IDs. The output might be provided in a spreadsheet or text file format.

It's worth noting that some bulk Facebook ID finder tools may violate Facebook's terms of service, as Facebook restricts the use of automated data scraping and similar tools that can access Facebook user data without permission. Therefore, it's important to use such tools carefully and in compliance with Facebook's policies.