Yup, quick Google search will take you to brand guidance and files:
Facebook: https://en.facebookbrand.com/facebookapp/
Instgram: https://en.instagram-brand.com/
Twitter: https://about.twitter.com/en_gb/company/brand-resources.html
Linkedin: https://brand.linkedin.com/downloads
All free of charge, and the correct up to date icons (I still see out of date Facebook icons on new vans!)