How to stop sponsored notifications in Facebook iOS app?

This week suddenly I’m getting new, unwanted notifications in Facebook iOS app. They do not appear in FB’s website/webapp. They say: > You might still be interested in [Sponsor’s Name]: “[Advertisement Name]… > > Sponsored Under the ellipsis menu, I am given these choices: * *Hide ad* – This will hide this single ad, but it will not stop the next. * *Report ad* – This also will not stop further notification ads. * *Why am I seeing this ad?* – This leads to a maze of legalese. Any ideas on how to stop, disable, prevent, opt out of these new sponsored notifications?