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scrimpy10 okay so obviously first, u need to understand what lookalike actually is. 1% lookalike is 1% of people in certain country that are most similiar to the audience you are creating lookalike from. 1% is the most "accurate" up to 10% being the "least accurate" (note that sometimes it doesnt really work like that and 10% lookalike can perform as well as 1%) And then the question, % of what? % of people in the country So 1% lookalike in US - is 1% out of US population. (on facebook). So out of the gate thats usually around 2. 5 million ppl audience. 1% lookalike in some small country, lets say mine, Czech Republic, will be around 100k, cause we are only 10 million peeps country. So basically you giving facebook some audience to create a lookalike from, right? then you choose country. And Facebook will find the people in the country, those are most similiar to the ppl in the audience. And as i mentioned before, you can choose between the closest similarity, 1% up to 10%, (where 1% out of US as i said will be lookalike audience of size around 2. 5 millions, 3% will be 3x that. 10% will be 10x that. ) you can also make straigt 3%, 6%, or all 10% together. But its better to separate them and test the different percentages in each ad sets. Hope you understand it well now :-)