Whatsapp is ubiquitous and is commonly used despite the long scary list of permissions it seeks ( see Help understanding Whatsapp's permissions )
Privacy and security conscious people would like to avoid it and use alternate means like Telegram but there are a huge bunch of people who are blind to the concerns and merrily use it
I am forced to use it, since I have a friends and relatives who are comfortable with this and won't consider switching - some got introduced to smartphones using this, for some others it is convenience of usage and the most common refrain is I have nothing to hide :-(
So my question boils down to How do I use Whatsapp without exposing my contacts and private photos to Whatsapp (read Facebook)?
This is a self answered question sharing one way and you are welcome to post other ways if you find