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I'd argue there is none, because friends and family already know how to reach you. However, both sites display ads.

I'm not saying there aren't drawbacks, but I can think of two benefits:

1. It makes some forms of investigative journalism easier. For example, there has been a lot of discussion about the potential problems of having most of the influential journalists in Sweden living within a very small "hipster" area in Stockholm.

2. E-commerce companies may decide to only ship to the adress where you are officially registered, making it harder to commit e-commerce fraud.

On the other hand it's trivial to change someone's official address. Just send a certain form by mail to the tax agency. (Not sure if they send a confirmation to the old address; but if they do, the perpetrator only has to pick someone who's on vacation; hello Twitter & Facebook.)

If you have registered an email / phone number they will send a message there about your changed address.

I don't know if they've done this yet but a while ago there were articles about them working on a way to disallow changing your address via the mail form:

http://www.dn.se/ekonomi/sa-ska-id-kapningar-forhindras/

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