Confused with facebook ads
I am really confused with facebook ads. Before a week I have started a campaign in order to attract likes to my facebook page. I have launched an ad and the cost was about 0,04euros/like which was "good" for me. When I have edited my campaign by only extending the duration of the campaign the cost has gone to 0,08cents per like.
One other strange example is when I have tried to edit an another ad for facebook likes by make the audience that the ad is shown from 18-65 to 18-35 as from the statistics this age group was responding much better to my ad again I noticed an increase in cost per like.
Could you please help me find out what I am doing wrong?
Thank you in advance
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