There is a legitimate question here -- do you own the information about your friends, or do your friends? Many things on Facebook are a shared quasi-public, quasi-private space where the ownership isn't clear, and don't fit into our usual mental model of "I own my own data!" This example is even clearer. The app lets you export your friends' names and contact information. This isn't your information, it's your friend…
Do they own this data?
Think about this before you blame people who just try to find a way to reconnect with their friends (who are ok with being your friend on FB) on another Platform.