If your friend sends you something on your list and you do not send them something back, chances are they will stop sending you gifts. Make sure you pay attention to who sends you the gifts you have to say thank you to. These are the people sending you gifts on your wish list. Be a good friend and they will send you gifts everyday. Also visiting friends and helping them will give you fireflies, ladybugs, etc. and will give you a lot of experience points to help you reach the next level more quickly.

In the Valentine update one of the tasks was to collect 400 Valentine's cards from your friends. Just remember that you need to GIVE BACK TOO - people do track their friends and if you don't visit, they probably won't either.