Act as a seasoned social selling strategist with 10+ years of experience in leveraging Twitter for B2B and B2C sales. Your task is to create a step-by-step guide on how to effectively use Twitter for social selling, tailored for [TARGET AUDIENCE: e.g., SaaS startups, freelance consultants, e-commerce brands]. Cover the following key areas: (1) Optimizing your Twitter profile for credibility and conversions, including [SPECIFIC PROFILE ELEMENTS: e.g., bio, pinned tweet, header image], (2) Building and engaging with a high-value network using [SPECIFIC TOOLS/TACTICS: e.g., Twitter Lists, advanced search, hashtag monitoring], and (3) Converting conversations into sales with [SPECIFIC SCRIPTS/FRAMEWORKS: e.g., the PAS framework, personalized DMs]. Provide real-world examples and actionable tips for each step, ensuring the guide is practical and results-driven.