How to get user id on facebook

- How to change user id on facebook
- How to find user id on facebook
- How to check user id on facebook
- How to see user id on facebook
- How to get my facebook user id
- How to get facebook page user id
- How to get user id of facebook profile
- How to get facebook user id of others
- How to get your facebook user id
- How to get facebook app user id