Act as a social media strategist with 10 years of experience in digital accessibility and AI-driven content optimization. Explain how artificial intelligence can enhance the creation of [descriptive alt text] for images shared on Twitter to improve accessibility and engagement. Discuss specific AI tools or techniques, such as [object detection] and [natural language processing], that can automate the process while maintaining accuracy and relevance. Include examples of how optimized alt text can benefit users with [visual impairments], improve SEO, and increase audience reach. End with actionable tips for brands to implement AI-driven alt text strategies effectively.