Ebsta Chrome enables you to add new records to Salesforce directly from LinkedIn.
1. Open Ebsta Chrome by clicking on the Ebsta icon 
in the top right-hand corner of your browser.
2. Hover over the +Add button in the bottom left-hand corner and select Contact.
2. Complete the relevant fields and then click Save.
3. You will then be directed to the Contact record once it has been created where you can then record activities and Events, Chatter and more.
Recommended next reading:
How do I add a Lead to Salesforce?