Yes! A Facebook advertising certificate will definitely open new doors for you. Big-scale companies usually need to hire Facebook ad managers to deal with everything related to their Facebook paid marketing efforts. You can also work as a Facebook advertising analyst to oversee the company's Facebook marketing strategy and maximize its ROI (return on investment).
According to Glassdoor.com, Facebook ad managers earn an average annual salary of $50,000, while Facebook advertising analysts make around $40,000 per year. You can expect these numbers to be higher with some experience up your sleeve, but a Facebook ads certification is definitely a good starting point that can help you land an entry-level job.