I really don't think this is going to be that big of an issue (though, probably not the best place to spark a whole debate about this, so let's not.)
However, if you're sure you want to migrate to Hi5 then I don't think there's an active procedure in place.

Of course the developers will probably be able to transport your account from one server to the other (if the versions are compatible, etc. etc.), but am not sure they'll want to do this for everybody...

book can do whatever they want to do with my false information. Yes, my profile is rife with falsehoods as many people constantly tell me, but it's intentional.
As for Ads, at home I have Adblocker and greasemonky scripts and other stuff and never see any adverts on any of the 8 different browsers that I use. When I'm away and forced to have to use others computers, I make it a habit to notice any Ads targeted to me and to do more than just ignore them, I go out of the way to make living hell on any company that does that.