Myths and Facts about Google Adsense
Myth: Since wide ads (336×280, 300×250 and 250×250) are effective in many websites, it must also be doing the same thing in my website.
Fact: Not really. Every website has its own characteristics; you cannot just follow what people said and then hope that your CTR will drastically increase. Try to do your own experiments with various ads and placements. Perhaps ads unit that are not effective in another website are your most profitable ads.
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