what is the main Problems of online advertising?

[Akdu]

Online Advertising is very cheap and effective, due to the increased inclination of the Contemporary Societies towards the Concept of Internet. This is although, not guaranteed, because the increased amount of Traffic gathering on Online Websites upsets Viewers, especially those of Commercial Relations. Also, Online Adverts are usually considered as Spams and Viruses, which is why People tend to ignore them or prevent themselves from indulging into them.
Facebook Adverts though, are effective, and can be used to increase Awareness.

But in my Opinion, Online Adverts are more profitable when used for Awareness, rather than for increasing Sales and initiating Action.