There's a growing tendency for companies to not reply to job applicants who've not been successful. This is not only highly disrespectful, but harmful for a company's reputation. Use rejections as an opportunity to enhance your applicants' prospects and your own reputation.
Whether a company's values go no further than a link on their website, or are rooted through the organisation, there's often one that ranks higher than the others. And usually, the company's leadership has little control over it.
Do you know what yours is?