And most of the people do as well, specially if they are interested in your content.
Click on this picture!
Linkedin gives you a lot of places for URL-s, like updates, Linkedin Groups, Linkedin Company pages and comments in all the above places.
And obviously in advertisements.
If you are a job seeker, go and check the company's page you are willing to join and comment their posts. Tell them to call you!
If you have a business, offer service and tell your followers to send you email, or ask you a question.
For instance, you can ask your followers outside the Linkedin to follow your Linkedin Company page.