For anyone concerned about privacy, this is helpful
Further to my blog linking post on 15th March
Please also read the following from Mike Murphy on Quartz Media LLC:
If you’ve been on Facebook for a while, you’ve probably installed games or given sites permission to log into your Facebook account. You may even use Facebook to log into services like Spotify, Netflix, or Tinder.
But if you’ve been following the news around Cambridge Analytica, the data consultancy firm hired by the Donald Trump campaign for the 2016 US election that harvested the data of up to 50 million Facebook users without their permission through data collected from third-party apps, you may want to know how to make sure that something similar isn’t happening to you.