Does Facebook pay for likes?

If someone views an ad for your Page and likes your Page several hours later.

it'll be counted as a paid like because it happened within one day of viewing your ad.

If someone clicks your ad then likes your Page several days later

it'll be counted as a paid like because it occurs within 28 days of clicking your ad.

A like is counted as paid if it happens within one day of someone seeing your ad or within 28 days of someone clicking on your ad.

If you want to post links like Diply or The Chive, you can expect $7–10 per 1,000 US clicks.