Reminder: There's never really been any evidence that the Trump campaign's digital ad targeting on Facebook was either an important factor in the campaign or was terribly effective.
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You can get 100m impression for maybe less than 100k depending on audience. I’ve spent $5m plus on Facebook ads and have gotten maybe 300-400m impressions and am considered tiny (barely even have an account manager at FB and am in the small business category).
Actually $100k might be a stretch on FB. But could do it on other ad networks. Could maybe get $3-5 cpm on FB so wound cost $300-500k.