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SAMCHA is an Australian backed Zambian Industrial Rubber and Conveyor Belt company. Currently located in Ndola, Zambia is the first of its kind on the Zambian market.
http://www.samcha.co.zm/

Australia, Germany and Ireland have shared their success in rolling out contact-tracing apps.
*HOW IT WORKS* When A and B meet, their phones exchange a key code. When A becomes infected he updates his status in the app.
*ALERT* is sent once risk analysis and contact matching is run within the database!

...you could still be sharing your status with people who are not in your friends list, like "friend of friends". So un-check that and only your friends can receive your Facebook posts!

...before you post your next status, make sure your settings allow an update to be viewed by qualifying recipients only, like friends and not the public, unless you want that. You post will become public if you don't select an appropriate group. U can also customize who see what post!