There isn’t really a “best” day to run a Facebook ad – it all depends on your goals and what you’re trying to achieve. However, there are some days that may be more effective than others. For example, ads targeted at businesses may do better on Tuesdays and Wednesdays, when people are typically back at work and thinking about their next steps. If you’re running an election campaign, you may want to target voters on Sundays, when they have more time to spend online. And if you’re looking to increase brand awareness, you may want to run ads on Thursdays and Fridays, when people are typically more relaxed and have more time to browse the internet. Ultimately, it’s important to test different days and times to see what works best for your specific campaign.