In our series of letters from African journalists, media and communication trainer Joseph Warungu looks at why Kenyans are becoming wary of what they post on social media.

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Picture this: you're having a great Christmas holiday at a fabulous location abroad. You walk into a fancy restaurant and order an exquisite meal. And because you have a loyal band of followers on social media, you decide to take good pictures of the sumptuous meal and share them.

How else would people know that you've eaten food that your village mates have never seen in their lives and whose name even you cannot pronounce?

And when you press "share" - the immediate reaction is: "Oooh, mmh, nice! Look at you! Wow!" This is quickly followed by cute comments on how they wish they were there.

But in Kenya there is now another hidden follower, tracking every step you make, every photo you post, every meal you eat, every car you flaunt, every house you show off.

This loyal follower is the taxman.

You see, the Kenya Revenue Authority (KRA) has confirmed that it uses communication technology to enforce tax compliance.

This includes blockchain, artificial intelligence, machine learning and data mining technologies.