Earlier quoted context omitted.
"Workplace" accounts are completely separate, with the exception of an optional link to your personal account to make it easier to log in. To my knowledge, no other data is shared. Your employer owns the data, not Facebook. See https://workplace.fb.com/trust/ .
Sorry you're being downvoted. This is useful information that allays some of my concerns. Thanks.
No worries, Facebook only owns the meta data it generates from your business data. /s