Absolutely no deal breaker. I am just interested to learn about the person in front of me (hopefully the candidate does the same about my company or me, after all, the candidate shouldn’t start working for a manager that they later find out they don’t like). If you’re not on social media, I won’t judge that, in fact if you do it for conscientious or fact-based reasons I even appreciate it. But if you are on social media and you have a beautiful CV on LinkedIn it can be a little plus, getting into weird political discussions on insta is definitely a minus; I need fact-focused employees that can see both sides of the medal, willing to (unemotionally) find middle ground. The CV and application letter are still the key thing. In the application letter, you need to address the needs that I have put into the job posting, the more fact-based and interesting the better. Adjust the cv so that it fits the actual job description, don’t use some outdated listing that you’ve been using the last two years, try to show that you take me seriously.