Adding LinkedIn to your FullContact account is very easy. This is accomplished in just a few quick and easy steps.
You can start this process by clicking your profile photo / avatar in the top right-hand corner of the Web app. Then, click on Settings.
Once in the Settings page, select Import from LinkedIn and it will open a pop-up window that will direct you to LinkedIn; here you can automatically start the download process. If you use Chrome, you can drag and drop the file into the FullContact page. For other browsers, close the pop-up window and select Upload from Computer (or drag the file from your folder).
Keep in mind that you'll want to re-import your LinkedIn contacts approximately once a month to make sure that FullContact has the most up-to-date list of your LinkedIn connections.
Lastly, you can choose how LinkedIn is added to your syncing contacts at the moment of import - you can set it to Update Existing Contacts or Add all LinkedIn contacts as New Contacts to your syncing list.