From Webkinz Insider Wiki
The Message Center is a feature in Webkinz World that was added on December 7, 2011.
The Message Center allows members to receive friend requests, party invitations and messages, such as requests for help with the Webkinz Challenges. It also features a Friend Finder area where you can either add yourself to a list where people can send a friend request to you, or you can send friend requests to people from a list of members that want friends.
The Friend Finder allows you to add other members who choose to appear in the list as your friends. If you choose to appear in the list, members will be able to add you in the same way.
The Message Center is used in several Webkinz Challenges. It is used to request that friends send you the item that is necessary for the task. You can also recieve a request from other friends to send them challenge items so that they can complete the task.
List of Challenge Items
Here are the prizes that you can "ask" for or buy for 500 eStore Points in certain Webkinz Challenges. The 500 eStore Points are NOT required in order to give or receive challenge items. This is only an optional method to speed up progress.