You can find someones profile by clicking on the first letter of their username then selecting their name from the list

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LadyD
lanac
Lauren_86
lazarus
lchatburn
Leah
Leap2003
lebman
lee
Lee Pursey
Leee-aa
leelo
leesylou80
leia
Leif
Less Than Jaap
Lexy
li
Lightworx
Lil
lilachawk
lil_miss
LiL_Mz_FuNnY
LinkinPark
lintonygb
Linz
Lioness
liquid_running
littletush2000
Littlewitch
Little_Miss_Muffet
Liz
LIZZIE
lizzieslayer
LOB3Y
Lobotomy
Lock
Logan's Dog
Loki
lolivictor
LondonExpo
London_Expo
longzhuren
Lori
Lorraine
lou
Loui
Loujareth
love monkey
Loxx
lucifer
luka
Luke
LUSHESBLONDE
Lyndz
Lynz
Lynzi
Lysa
Lysia