This example is even clearer. The app lets you export your friends' names and contact information. This isn't your information, it's your friends'. What if one of them wanted to take their phone number off the site? What if one of them wanted to hide their information from you specifically? If you've downloaded it already you're depriving them of the right to control their own data.
Clearly social networks should be required to offer some sort of friend list information for export. Maybe a bare list of user ID's is all that should be required -- the information about who your friends are seems legitimately like it's yours. Joining it against names and contact information is the potentially privacy-invasive step; that could be done online, under control of your friends, not you.