I'd run a lead ad targeted towards people with similar job titles or at competing companies. Include relevant job information (title, salary range, etc), then promote the ad as "easy application" and require full name, email and phone. Once they apply, send an email requesting their resume or get them on the phone. I work for a digital ad agency (AdvertiseMint) that specializes in Facebook and Instagram ads, we could help you set these up if needed. - Brian