Getting Free Daily DP by Greeting Friends

-The game has little actual social interaction. But you can have up to 100 friends. You want to have 100 because every day you can get 10dp each for greeting them, and 10 back per friend that greets you back.

If you don't know 100 people with the game, go into the virtual arena, click on peoples names and send friend requests until you have 100 friends.

Now, once per day, go into your profile, scroll down to and hit the "Greet all Friends" button, write something clever (like the url to this webpage: duel-arena.secretstories.org), and hit send. You get 1000 dp instantly, each of your friends get 10, and you get 10 more each time one of them sends their greeting.

On a side note: You are able to duel with people on your friends list, but doing so consumes stamina as normal but yields no DP for either player.