[Tagging] Unification of google-plus links

[Andreas Goss]

> I would like to unify the keys for google-plus-pages of objects in the
> Database.

I think that's usually fine.

> I would like to change the Keys in "contact:google_plus"
> change them in "contact:facebook"

I'm not in support of this though. contact: is not commonly used and I 
don't think is has that much support either. For addresses most people 
use addr:, phone= and website= are much more popular than 
contact:phone/website=. So I really don't see a reason why we should use 
contact: for social media. facebook=*, google_plus=* works just fine in 
my opinion and it's also what a lot of mappers use.
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openstreetmap.org/user/AndiG88
wiki.openstreetmap.org/wiki/User:AndiG88‎