Experienced recruiters actively use open-source intelligence (OSINT) platforms to find the best candidates.   Here are some ways in which recruiters can use OSINT:

1. Social media: Recruiters can use social media platforms like LinkedIn, Twitter, and Facebook to find potential candidates. They can search for candidates using keywords related to the job position and evaluate their profiles to determine their skills, experience, and qualifications.

2. Online job boards: Recruiters can use Indeed, Monster, and Glassdoor to find potential candidates. They can search for candidates using keywords related to the job position and evaluate their resumes and cover letters to determine their skills, experience, and qualifications.

3. Professional association websites: Recruiters can use professional associations like the Association for Computing Machinery (ACM) or the Institute of Electrical and Electronics Engineers (IEEE) to find potential candidates. They can search for candidates using keywords related to the job position and evaluate their profiles to determine their skills, experience, and qualifications.

4. GitHub: Recruiters can use GitHub, a popular platform for hosting and collaborating on open-source software projects, to find potential candidates with relevant coding skills. They can search for candidates using keywords related to the job position and evaluate their contributions to open-source projects to determine their coding proficiency.

5. Online forums and communities: Recruiters can use online forums and communities like Reddit, Stack Overflow, or Quora to find potential candidates with expertise in specific areas. They can search for candidates using keywords related to the job position and evaluate their contributions to these communities to determine their knowledge and experience.

Overall, OSINT can be a powerful tool for recruiters to find and evaluate potential candidates for job positions. However, recruiters need to use these techniques ethically and respect the privacy of candidates. 

The biggest question our clients have is which one is the best source? There is no one-size-fits-all answer to this question, as the best open source intelligence (OSINT) sources for information technology (IT) recruiters will depend on the specific job requirements, the type of organization, and the candidate profile that they are looking for. However, here are some OSINT sources that IT recruiters may find useful:

1. LinkedIn: LinkedIn is a professional social media platform widely used by IT professionals. Recruiters can use LinkedIn to search for potential candidates, view their profiles, and connect with them. LinkedIn also offers paid recruitment tools (LinkedIn Recruiter) that provide advanced search options, insights into candidate behavior, and targeted advertising.

2. GitHub: GitHub is a platform for hosting and collaborating on open-source software projects. Recruiters can use GitHub to search for potential candidates with coding skills in specific programming languages, view their contributions to open-source projects, and evaluate their coding proficiency.

3. Stack Overflow: Stack Overflow is a popular online community for developers to ask and answer technical questions. Recruiters can use Stack Overflow to search for potential candidates with expertise in specific programming languages or technologies, view their activity on the platform, and evaluate their knowledge and experience.

4. Meetup: Meetup is a platform for organizing and joining groups with common interests. Recruiters can use Meetup to search for potential candidates interested in specific IT topics or technologies, view their profiles, and connect with them.

5. Google Search: Recruiters can use Google Search to find information about potential candidates, including their professional background, work experience, and online presence. They can use advanced search operators to narrow the search results and find relevant information.

Overall, IT recruiters should use these OSINT sources and others to comprehensively view potential candidates and find the best fit for their organization.