The L/F Ratio or Likes/Friends Ratio is designed to measure what percentage of your Facebook friends like your
profile picture.
It is obtained by dividing your profile picture's likes by the number of friends you added, times 100%.
For example: 50 likes, 300 friends -> 50/300 x 100 = 16.7
The L/F ratio is a really handy tool when you want to figure out how many of your
Facebook 'friends' are really
interested in you! Also, it enables you to compare your ratio to your friends'.
A typical L/F ratio lies somewhere between 3 and 20