I suppose this is just part of a continuing trend with Ubuntu and also with various applications to leak information onto the Internet for questionable benefits in return.
Of course, it can be said that with browser search boxes pointing at Google by default, there's already an uneasy contract between the user and the organisation whose logo is next to the text widget, and I'm sure there have been quite a few accidental queries over the years.
And stuffing an application's menu with "Share on Facebook/Twitter/Picasa/Flickr/Pastebin!", although potentially confusing to new users and yet tempting to those who just want a simple "sharing" solution but who lack the experience to be able to consider that solution's cost in terms of relinquishing privacy and control, at least still upholds a distinction between private and public domains.
But integrating various online services with a built-in desktop feature that the user is relying upon to perform local operations really does border on an intrusion of privacy. It's bad enough that there are actually adverts in Ubuntu - go into the software centre and there's a banner advert, Web 2.0 style, for various products - but playing fast and loose with data originating in a private context is inexcusable.