[Tagging] Unification of google-plus links

[Tobias Knerr]

On 29.08.2014 20:09, Andreas Neumann wrote:
> I don't want to change the addr:-, website-, phone-, fax- or
> email-key!!! I never said it.

But we have to look at these to decide whether it's better to move
towards the contact namespace as a whole or move away from it. It makes
little sense to move a couple keys toward "contact:" when the general
trend is to avoid its use.

In a similar discussion recently, I summed up the popularity of the keys
with and without "contact:" prefix. As of the 25th of July, the taginfo
numbers were:

no contact prefix: 1033228
contact prefix:     154241

> The contact-namespace associate, that the defined facebook- or
> googleplus-page are a medium to communicate with the defined object. I
> know a lot facebook-pages, who are created from fans or generated from a
> wikipedia-pages. That are mostly not a communication channel.

There is no difference in meaning between contact:website and website,
both do _not_ allow fan-made pages. This should make it obvious that the
contact namespace does not imply a different meaning, it is simply a way
of organizing keys. One that most mappers don't use.