Reach

 The number of unique people your ad was served to

Frequency

The average number of times your ad was served to each person

Impressions

The number of times your ad was served. On mobile an ad is countedas served the first time it’s viewed. On other interfaces an ad is served the first time it's placed in a person's news feed or each time it's placed in right-hand side

CTR (Click through rate)

The number of clicks you received divided by the number of impressions.

Likes 

The number of likes on your page as a result of your ad.

Cost per like 

The average cost for each Page like as a result of your ad

Engagements 

The number of actions related to the Page and your Page's posts as a result of your ad.
Page engagements include likes, comments, shares, link click, photo view, video views

Cost per engagement 

The average cost for engagement as a result of your ad.

Conversions 

The number of other conversions on your website that happened as a result of your ad.

Cost per conversion

The average cost for conversions as a result of your ad.

App installs 

The number of app installs that happened as a result of your ad.

Cost per install 

The average cost for app installs as a result of your ad.

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