[Tagging] Contact:* prefix

[Dave F.]

Hi

wiki.openstreetmap.org/w/index.php?title=Key:contact

I remember a discussion a while back about this. As the page makes no 
mention of the logic behind, could someone please remind me of the 
reasoning & advantage over straight forward phone, fax, website etc.

"You should only add contact informations to POIs and not to any private 
address!"

By 'POI' does he mean 'public company'?

Thanks
Dave F.

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