So, i have started a campaign of about 15 different ads, targetter tightly by interests to groups of 10-20 thousand peolpe. In the first couple days i was bidding 0.15 CPM, and my click through rate was 0.15 - 0.4%, i was getting clicks for 7-10 cents, the real CPM was about $0.10 and everything seemed great. Then (and that happened in a matter of 2-3 days) my CTR started to plummet and dropped to some measly 0.05%. This came as a big surprise to me, as the ads were tightly targeted to the users' interests; the image, the title, the ad text - everything was highly relevant. I figured that the decrease in the CTR could have been caused by the fact that my ads started showing on lower positions (below the fold), so many of the times they won't even be seen. So i raised my CPM bids to 0.80, and this has helped. For a short time. The CTR went up, so did the real CPM, now i was paying some 0.30 per mile, but since the click through ratio was good, it was still worth it. Then again, in a very short period of time (a matter of 2 days), the CTR went down to some 0.07% again and i started losing money big time. Lowering my bids to $0.20 didn't help at all, as the only thing that really changed was the number of impressions, and each click would still cost me about 25 cents. I'm really puzzled here. Is it normal that a campaign only performs well for a short limited time and then its performance starts to degrade? So, my question is simple: how can this peculiar behavior of FB ads platform be dealt with?