I did just recently, as I thought they wouldn't like me due to their username (can I plead bizarreness?)
Conversely, have you ever commented on someones comment, simply because you like their username?
How do you feel about commenting on other peoples threads in a friends lj?
personally, I like it, To me lj is all about interaction, but I have seen some people see it as hi-jacking. Not me :) anyone on my friends list here, reading this - feel free to comment on other peoples comments if you feel so inclined.