There is a difference in advertising when it is like some "BUY THIS TSHIRT" sidebar thing and the more pernicious "promoted" story that shows up in your feed you are consuming all times a day.

Also listed in this article is an app called Muslim-Pro which apparently helps with prayer times etc. As someone who is not American, I wouldn't trust this as much as everyone is freaking about Huawei being part of 5G.