Testimonials. If case studies aren't a good fit for your business, having short testimonials around your website is a good alternative. For B2C brands, think of testimonials a little more loosely. If you're a clothing brand, these might take the form of photos of how other people styled a shirt or dress, pulled from a branded hashtag where people can contribute.
Because it's such a popular communication channel, it has wide-ranging integrations with plenty of other tools. You can tack on a seemingly unlimited amount of integrations and Slack applications to make the tool even more powerful -- for instance, many teams will pipe in A/B test results, analytics notifications, new customer or transaction notifications, or even sales or customer support bots. While undeniably powerful, Slack is easy to start using immediately.