Hay Day has quite a robust social element, for an iOS game, allowing you to interact with other players from the off. You can perform tasks such as buying and selling, as well as visiting their farm. You can interact with friends and complete strangers alike.
There is no direct communication in Hay Day - instead, people have worked out ingenious ways to make specific trades with specific people. See the Trading section of this guide for more information on that front.
There are many advantages to being as sociable as possible while playing Hay Day. For a start, you will make a lot of money selling items to your friends. You will also find yourself missing certain items and the only methods to get them will be to use precious Diamonds, or to get them from your Friends. There are also numerous advantages to visiting the farms of other players.
You can use the computer-controlled 'Greg' as your friend early in the game until you add some people from Facebook
Adding a Friend:
To add a friend to your list, click on the Friend Bar in the bottom right of the screen. Then, click on the pig with 'Add Frens' written on it. This will take you to Facebook, allowing you to link that with your Hay Day account.
Visit a Friend:
To visit a Friend's farm, first, access the Friend Bar. This is in the bottom right-hand corner of the screen, indicated by a group of people. Then, tap the picture of your particular friend to visit their farm. While at a Friend's farm there is plenty you can do, for starters, visiting their Roadside Shop.
To return to your own Farm, tap the Home icon in the bottom left-hand corner of the screen.
When visiting a friend, as well as visiting their Roadside Shop, you can also find mystery chests and get bonuses from opening them, just like with your own farm.
Follow a Friend:
To follow a friend's farm, you first have to visit it.
Then, at the top of the screen next to the picture you will see a flag. Click on the flag to complete the process and follow your friend's farm.