Facts and tables are not copyrightable. The phone numbers in a phone book are not copyrightable, merely their presentation order[0]. If you were to copy, say, the linkedin website, or the linkedin branding, or the name linkedin, or any of their ads, those would be eligible, but the simple collection of names, emails, and phone numbers is ineligible for copyright.

0: https://en.wikipedia.org/wiki/Feist_Publications,_Inc.,_v._R....