What are like cards for?

Like cards are special cards that can be used to 'like' someone. This gives a certain % bonus to the players market earnings, i believe for 1 hour. To do this easily just go into chat, select a players picture, select visit and the like option will be available at the bottom of the screen image of the players estate. You must have a like card to do this obviously. But you can also type on chat if you have a card or more and request a 'like for like/ delude/ attend feast'. Most players do this as well. The same applies to the 'Delude card'