When VM uses social media and other advertising partners for marketing purposes, your information will be shared so that they can
check if you hold an account with them to enable VM to show you targeted ads
but also to identify your marketing doppelganger by identifying people that have similar interests as yours (known as lookalike audiences), to target those other people with VM sales tripe.
But this is all apparently fine as VM advertising partners can only use the information if you already hold an account with them.