After contributing to an open source project, is it a crime to post that I contributed to it on my socials or put it on my CV that I did?

 No, it is not a crime to post on your social media or include in your CV that you have contributed to an open source project. In fact, it is encouraged to showcase your contributions to open source projects as it demonstrates your skills, expertise, and passion for technology.

Open source projects are typically licensed under permissive licenses that allow contributors to use and share the code, as long as they comply with the license terms. Therefore, you are generally free to share your contributions to the project and promote your involvement in it.

However, it is important to give credit to the original project and follow any attribution requirements specified by the license. It is also a good practice to consult with the project maintainers and ask for their permission before making any public statements about your contributions, particularly if you plan to disclose sensitive information or proprietary code.

In summary, you are free to post on your socials and include in your CV that you have contributed to an open source project, as long as you comply with the license terms and give credit to the original project.