You do not see users using facebook to sign in complaining so it is also likely that facebook also paid them to do this. If reduced sales is not a concern for ebay due to users becoming annoyed about the numerous issues they are creating. Then there has to be another source of revenue to make up or compensate ebay in return.

https://community.ebay.com/t5/Shipping/Random-Tiny-Things-from-CS-OrangeConnex-com/m-p/31415516#M354168 <P>It is likely a brushing scam, but you are not the victim.