Can anyone recognize this URL coding? It looks like gibberish. Causes forwarding

I am trying to read around 60 ULRs that I think are suspicious. I run a FB group where people are posting and sharing these links, and I am concerned that they have some kind of embedded spammer info (multiple forwarding involved). My goal is to be able to read these urls so I can remove the forwarding.

Below are different versions of the same url.

Original url:

https://l.facebook.com/l.php?u=http%3A%2F%2Fsl.bingobash.com%2Fwf%2Fclick%3Fupn%3DeAmuHc6AWJHwjkfJkBnXz8CXYLiAPcrPRsKNalHrjVKK8b-2FjSwu3IFsc1gm3TcCIYw23-2F3-2BcGodnZ-2FtBDLw3zAjJiqV-2BrqxVUfbn-2FWQymnduncmwlXLTfl2EH-2FBigiPCWWuwWDQKbNVEGtVb-2BRJVhyMFa-2FJgdI7RCDbznRKyZpP69sPiNTnQOcNDxSpbsSzv8K83-2FD9qlX3AYYKLVCPNp27jUL404bE3i-2B7Vmzlff0gJpwWZzxLDUCULCHTOj2LyTOmhhAr-2FxLNtROUavtdy4g-3D-3D_8YvUYBAH2geLvqCZosiqpd42SBSLRaDsipEzDArgK6sxpr3pPy0j-2FTRuiv-2BjUQDNdCkSDFQe1lZ7IdQ0i4WRj-2BQU3ir7p1l6H914wdSFqBbCII59-2BqWkUJYvSkFtyktdMpFnUJbMmiBpHqJ1swVW9JyL-2FERBhkFRsllFps7drYyF6CmG8YKe0jSQ7wqpaNlZNT7JFdc1WrngIyQLUyD-2Fv4IoIo1jx7wvOUJJWJ8kplHH94Jf4YL6r0du9QMY-2FSZtAuVJruVecLTPlyAWrURMggSQEaSMmhf3sOWP1Iq7NqUmtaw0DV-2FaVbG0GeI-2FyqdzlqLgqzxFKRTp0RzS17Eu3-2Bia5EPQRIzq1aVGL40XTDjRAaVuZaCzmoLuXPRTBe-2F47GE-2BbHjmwY4vtZZwLfUI59wZGvBACtsvkHyvtVeggV0-3D&h=ATOuBZYt3yDeUcmQ2nVEFVov1wJSyvUx3afsYGH2lecKX6rqTrPwwtBAQvRubERVf68ypY9thBFDbaFfmrczu4NfjACQEW3Sz_fUqi2dCU7KI7lwCxzpiahOR0AmHKkwJw9iqqfWxFZcLMoDKdLonQ

After decoding the % codes and removing the obvious double url:

http://sl.bingobash.com/wf/click?upn=eAmuHc6AWJHwjkfJkBnXz8CXYLiAPcrPRsKNalHrjVKK8b-2FjSwu3IFsc1gm3TcCIYw23-2F3-2BcGodnZ-2FtBDLw3zAjJiqV-2BrqxVUfbn-2FWQymnduncmwlXLTfl2EH-2FBigiPCWWuwWDQKbNVEGtVb-2BRJVhyMFa-2FJgdI7RCDbznRKyZpP69sPiNTnQOcNDxSpbsSzv8K83-2FD9qlX3AYYKLVCPNp27jUL404bE3i-2B7Vmzlff0gJpwWZzxLDUCULCHTOj2LyTOmhhAr-2FxLNtROUavtdy4g-3D-3D_8YvUYBAH2geLvqCZosiqpd42SBSLRaDsipEzDArgK6sxpr3pPy0j-2FTRuiv-2BjUQDNdCkSDFQe1lZ7IdQ0i4WRj-2BQU3ir7p1l6H914wdSFqBbCII59-2BqWkUJYvSkFtyktdMpFnUJbMmiBpHqJ1swVW9JyL-2FERBhkFRsllFps7drYyF6CmG8YKe0jSQ7wqpaNlZNT7JFdc1WrngIyQLUyD-2Fv4IoIo1jx7wvOUJJWJ8kplHH94Jf4YL6r0du9QMY-2FSZtAuVJruVecLTPlyAWrURMggSQEaSMmhf3sOWP1Iq7NqUmtaw0DV-2FaVbG0GeI-2FyqdzlqLgqzxFKRTp0RzS17Eu3-2Bia5EPQRIzq1aVGL40XTDjRAaVuZaCzmoLuXPRTBe-2F47GE-2BbHjmwY4vtZZwLfUI59wZGvBACtsvkHyvtVeggV0-3D&h=ATOuBZYt3yDeUcmQ2nVEFVov1wJSyvUx3afsYGH2lecKX6rqTrPwwtBAQvRubERVf68ypY9thBFDbaFfmrczu4NfjACQEW3Sz_fUqi2dCU7KI7lwCxzpiahOR0AmHKkwJw9iqqfWxFZcLMoDKdLonQ

When clicking on the original URL, it goes through a number of forwards and eventually creates a valid url:

https://apps.facebook.com/vegas-app/play.php?type=FCcurlemailCODACH1973R309S1514613600E1515391199&item_id=0&ptyp=EMAIL&ctyp=CODA_S909362&ref=email

ALL of the encoded urls begin with this:

https://sl.bingobash.com/wf/click?upn=eAmuHc6AWJHwjkfJkBnXz8CXYLiAPcrPRsKNalHrjVKK8b-2FjSwu3IFsc1gm3TcCIYw23-2F3-2BcGodnZ-2FtBDLw3zAjJiqV-2BrqxVUfbn-2FWQymn

I have searched for answers, but since I don't recognize any part of the gibberish looking part, I'm at a loss of useful keywords for searching.

Can anyone recognize the gibberish part or give me any clues about it? I'd greatly appreciate any help anyone can offer.