December 2017 isnt that far
The testnet will be launched a month after the ICO so thats a great reason to hold your investment. Then 3 months later they release the official platform.
So invest now if you believe in this project.
Profits will be there very soon!
the datum tokens should be held for as long as possible if you want to make money. then again you can make new ones by selling your data
Why would you say should I hold my tokens as long as possible? What is it exactly that I need my tokens for except buying data?
At first, many projects will buy from facebook but if they know that they can also buy from DATUM they will buy where date is cheaper.