Putting friends into your "Best Friends" list allows them to appear on top of the friend lists in your Blog and Profile.
You can have up to a maximum of 100 Best friends!
The "best friend" you want to add must already be in your standard friend list.
1) - Log-in > My friends > Best friends
2) - Enter the username you want to add
To change your best friends, head to the Best friends tab and remove contacts by clicking on the red cross.