This really is a must to make the social and campaign review feature at all useful. As many others have said, the social tool for LinkedIn publishing through HubSpot has many limitations: you can’t post many of the options available through LinkedIn, such as documents, and for some strange and annoying reason you can’t tag people. Consequently, many posts must be made through LinkedIn itself and so being unable to retrospectively assign a campaign makes the campaign aspect of HubSpot almost pointless.