You can allow users to like a specific item or product by adding the "social button" option in your layout builder.
EVERY page that has an item/product list frame has a layout builder. First you should determine where you want to display your like button. (whether its on the Item/Product page or Item/Product details page.
When you are in your layout builder you may want to make some columns for the social buttons to keep them together and neat.
In this example I have added 4 columns. (3 for my buttons and 1 to use up the extra space so the buttons are together)
In the first column I am going to put the Facebook like button. to do this you need to go to the column or space you wish to add it and then click the "+" button and select "social button".
see screenshot:
Once you click on the "Social Button" option you will have a screen pop up with options for what type of social button you wish to display.
see screenshot:
In this example I wish to add the "like" button, include the "send" button, and have the layout with the button and counter horizontal. You will see an example of how it will look as you change options in the bottom window.
Click apply.
Then be sure to Save your layout. and preview.