Swipe ideas from some of the best Facebook ads
Someone knows something YOU don't. In this case, it's Leadfeeder, and they know something about LinkedIn which you are probably not aware of - until at least you click on their advert (and go through a sales funnel).
That's the primary tactic on this ad. When we feel we're not part of some knowledge, we actively seek out the answers to satisfy our curiosity.
Is there something you are aware of in your industry that you can capitalise on by creating a curiosity-based ad?