It's better to buy tokens before the platform is released, if you believe in the success of the project. with me it was so many times when I regretted that I had got on the wrong train. I think Datum moon-train what you need.

Well this is becoming scary... behavioural data and an AI which analyses that ... I don't think I want this to happen. Imagine being constantly harassed by marketing companies with products that seem to be tailored to your behaviour? Hmm no thanks.
I'm pro selling our gathered data to some companies for medical research and advancements of technology but it will be a fine line to being misused.

Datum is the revolution of personal data. It empowers individuals by giving them the ability to act directly on their data and by limiting interactions with intermediaries. This Changes complement the face of the world of data.

Exactly, Datum platform has very big potential but developing that big platform is very time consuming process 

Holding until the release in march 2018 is the smartest thing you can do.
Really cant wait to finally see this ICO start, it will happen this month! YES! Very curious how everything will go.

DATUM will be the next big thing next month.
Everyone will be following this ICO.

But if AI gets more advanced your personal data will be worth much more because advertising will be better suited for you.

Actually its a chance for double profit, holding the coin will almost definitely bring you a profit long term and like you sad, your data has some value which you will be able to sell.
If this project kicks off like its planed, it could be really successful. 

Now a lot of ICO is out and I don't see the working platforms created, it takes more than a year.

Exactly. You'll just have the power to sell your data, I don't think it will impact the behaviour of companies to get our iniformation except if the price to get them is cheaper than their old ways of doing it.