Talk:List of number-one singles of 2018 (Portugal)

It says it's official from AFP chart but the sources are all form a Nielsen Chart publish on weird website and in Portugal I've never even seen this chart anywhere.
The only official chart printed in Portugal is the same one Billboard magazine publishes "Portuguese Digital Songs". What chart is this? Also that website has lot of charts from other countries that ARE NOT the official ones. The website used as source does not seems legit and as all the info here is different from the one printed on Portuguese press and magazines (and Billboard Magazine) I suspect this is not the official chart (as in Portugal I'VE NEVER even seen these charts).