Yes, for now, although it would surprise me if changes haven't already been negotiated with the UK government: Deputy Prime Minister Nick Clegg has been on Face

Yes, for now, although it would surprise me if changes haven't already been negotiated with the UK government: Deputy Prime Minister Nick Clegg has been on Facebook's staff since 2018. Even without that, it doesn't make sense for Facebook companies to store the UK data in the EU/Ireland, where it would presumably then have to comply with both EU GDPR and UK GDPR.