There are a couple of ways to do it (you may still have three, but Meta-tag verification is being phased out). They are a bit technical but rather straight-forward. Read More: Facebook Domain Verification: Link Ownership Control

Optimization, particularly for conversions, will be impacted quite a bit. Since Facebook is receiving less data and will be reporting fewer conversions, there is less volume to optimize for. Facebook needs 25-50 conversions per week per ad set to exit the learning phase, and that will become increasingly difficult. Read More: Facebook Ads and the… Read more »

All indications are that this shouldn’t impact interest targeting. Attribution, which is only related to ad reporting, also shouldn’t apply to website custom audiences. If a user opts not to be tracked, however, they should be expected to be removed from audiences. Read More: Facebook Advertising Audiences and iOS 14

Once the prompt goes live, you will lose access to the old attribution windows. Until then, you can run reports on historical data for attribution windows including 28-day click and compare those numbers to 7-day click. You should export this data to have access to it later. Read More: Facebook Ads Attribution and iOS 14

Facebook is making structural changes that will impact everyone. These changes apply to all web advertising, regardless of device used. Read More: Facebook Ads and the Impact of iOS 14