Just to expand a little on what Ty stated, some analytics do require specific data points to fire utag.link tracking.
For example, Google Universal Analytics will not make any call with utag.link if you do not map some data points. If you wanted to do a hit type of 'event' you would have to map data to Event Category and Event Action as GUA requires these:
If you wanted utag.link to do a hit type of 'social interaction' you would have to map Social Network, Social Action and Social Target:
For each hit type, if you only mapped 1 of these data points (i.e. Event Action is set to 'clicked' but Event Category is not set), utag.link will not fire for that intended instance. If you set all 5 of these data points, it would actually make two separate GUA calls, one for 'event' and one for 'social interaction.'
Some analytic tags don't require any special data to fire, though.
So utag.link will send to all analytics tags, but the only ones that fire are the ones that have their requirements met (some of which have no requirements and will thus always fire).