Act as a TikTok content strategist with 5+ years of experience in viral video trends. Explain step-by-step how to use TikTok's stitch feature to create engaging reaction videos. Include best practices for [CHOOSING THE RIGHT VIDEO TO STITCH], [ADDING YOUR REACTION EFFECTIVELY], and [OPTIMIZING FOR MAXIMUM ENGAGEMENT]. Provide examples of successful reaction stitches and tips for making your content stand out in the [COMPETITIVE TIKTOK LANDSCAPE]. Keep the tone casual but informative, tailored for creators looking to grow their audience.