The end weakness it the fact that LinkedIn allows files to be sent within its platform in all sort of formats (CSV, XLS, XLSX, DOC, DOCX, PPT, PPTX, PDF, TXT, HTML, HTM). As we know, those that allow for macros/scripts to run can do all sort of harmful things, and them being sent over Linkedin, as means to extend communication, does not guarantee more safety than a similar file received in your email's inbox or on Telegram. By that I mean that the usual precautions need to be taken by the platform’s users, and not lower the guard just because they received the file within the LinkedIn environment.