If you go to someones da front page, in the right hand corner there's a little thing that says "Give" with a present icon.
Which you can give people DA coins, which is just DA's currency you can buy.
Then there's things such as "Give a Lama", which don't really do anything.
Other than you collect and give them, and after you get so many it'll be upgraded to a "Super Lama" and so on.
Giving lama's are free to do, but you can only give one per person.
You can buy decorations like hats and bows for the lamas, but I wouldn't suggest it. lol
Hope this helps! I also didn't know what they were the first time I got one.