The format and tone of your follow-up communication depend on the context and purpose of your interaction. You can use email, phone, social media, or a combination of them, depending on your preference and the expectations of your contacts. However, there are some general guidelines to keep in mind: be clear and concise; personal and professional; respectful and courteous; and helpful and valuable. When writing, don't write long paragraphs or ramble about irrelevant topics - get to the point quickly. Use bullet points, headings, or numbered lists to organize your information and make it easy to scan. Be polite and courteous - address them by name, thank them for their time, and don't make demands or impose deadlines. Show some personality and enthusiasm but don't be too casual or familiar. Finally, provide some value or benefit to your contacts - share useful information, resources, or insights that relate to their needs or interests. Give them a reason to reply or take action.