Because you can only see the last 25 friends online, the game punishes you for having more than 25 friends.
I bought some extra friend slots and added lots of awesome people only to find myself DELETING people constantly so I can get down to 25.
Example of the problem:
If I have 40 Friends......Friend 35 has a Leader Card I am looking for......GOODBYE 10 friends so that my friend becomes 25th and I can actually see the Leader i'm looking for.
It is EXTREMELY annoying. I can only have a few friends at a time. My purchased friend slots are 100% useless.
P.S. This has been a problem I noticed DAY 1 of playing, but I just worked around it. Today I did it for the 100th time and I HATE deleting and adding the same friends constantly.