Companies often ask their employees to refer best talents they know, but they don’t provide them with the right “ammo”, i.e. nice handy information packet they can use to explain what the company does and why anyone needs to bother working there.
Think of your employees as marketers and empower them with nice sales collaterals. Teach them how to explain the company to their friends in 10 words or less. Create a wiki page with best practice (= high conversion) emails.