Talk:Viewable impression

"Viewable"

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wish I could clearly understand wht viewable means here. The first sentence defines Viewble Impressions in terms of "viewability" without clarification. Isn't there a simple, clear first approximation of wht viewable means?

"Other companies to offer viewable impressions include"

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is this list helpful? It could include hundreds of other companies and there seems to be little reason why these companies are listed and others are not.