Social media apps use your phone number to triangulate data such as purchase history, not to help you with two factor authentication or account security. Please LinkedIn. No you can't have my phone number.
Some folks don't agree (tweet).
In 2015 I warned people that LinkedIn was mining user data (contacts, calendars, etc.):
How to Manage LinkedIn Privacy – Stop Sharing Your Contacts
News article:
Music credit:
Hall and Oates - \"Private Eyes\"
","author_name":"Emily Binder"}