Speaking as myself, I would say no. Facebook and WhatsApp don't give me the warm fuzzies, and they have no place in the enterprise.
The exception might be Facebook's WorkPlace offering, which is commercial, but even this needs to be vetted by company legal to make sure the TOS/EULA shows that company data is protected and won't wind up handed over to some advertiser or foreign party.
I would allow a Web browser to access FB... but apps on company machines? No.
Slack is a glorified IRC chat. No really.
If you want to invest in these work apps, the best is probably Workplace from Facebook. https://www.facebook.com/workplace We use it everyday and it's great.
Microsoft has this thing called Office, and they are big enough to use that as leverage to push their own suite.
Internal or external doesn't particularly matter. Companies could use Signal, Wire, Wickr, or any other privacy conscious option for internal chats if they wanted to.
Encryption, as in end to end encryption, which this is not. The only thing Facebook mentions about encryption is at rest, which doesn't do anything for privacy. You can check it out here
We use O365 w/Sharepoint for work but basically its just email on the phones. Like I suppose they could download the rest of the O365 apps on their phone, but no one really does since we use laptops for that stuff (we're super small <20 people). The only other app we use is Workplace, and Workplace Chat, which is just used for company announcements.
So in my eyes, the only data on the personal owned phone would be their emails, and if they quit or are fired, I can just change their PW to prevent them from continuing to send them.
> Men er det rimeligt at en arbejdsplads kan gøre krav at man har fb konto?
Det er jo et andet spørgsmål end det OP stiller, men nej - en arbejdsgiver kan ikke forlange at du har en social medie profil, nej.
> Og hvordan "kontakter" - fb-messenger, opslag på din timeline, eller hvad?
Det er vel ligegyldigt i sagens natur?
> På mit arbejdsplads er det er krav at man kan kontaktes gennem mail, arbejdsmobil, og slack.
Vi har kun krav til hvordan sygemeldinger skal meldes ind hos os.
> At bruge fb til arbejdskommunikation virker meget amatøragtigt.
Tja, jeg kender flere større virksomheder som bruger workplace by Facebook som egentlig er et ret fornuftigt værktøj - jeg tror de vil blive kede af at gå at vide at de virker amatøragtige, fordi de bruger et Facebook produkt til intern kommunikation i virksomheden.
FB does have a subscription based model, just not for the main site. You could setup FB workplace for $3 a person with no ads. Workplace is pretty much the same thing as FB but with only posts from users on that space. It's pretty nice actually and much more group focused than standard FB.