Telegram is often seen as a secure platform for anonymous communication, but Open-Source Intelligence (OSINT) techniques can uncover critical user data. This blog explores methods for identifying Telegram users, tracking their activity, and extracting valuable intelligence from public channels, bots, and archived content. By leveraging Telegram IDs, username analysis, search operators, and custom search engines, OSINT investigators can systematically de-anonymize accounts and uncover hidden information. The blog also highlights tools like Telesint, TelegramDB, and the Wayback Machine for deeper intelligence gathering.