HubSpot says that LinkedIn boosted posts can't be tracked, but we've had some that do seem to track properly, even to the contact-tracking level. Others show contact tracking as pending or with an error, likely because of @ mentions included in the post (would love to see a resolution to this limitation).
The fact that some are tracking properly while other's aren't is making our social tracking a mess. Some are tracking as organic while others are paid; some we get granular tracking for, while others we get none.
Would definitely appreciate consistent, contact-level tracking on all boosted posts!