bold thread titles

[princessttc]

hey,
Could someone tell me why when some people post threads the name of the thread does not come up in bold while some other peoples does?

Is it related to the amount of threads that one has posted?

thanks heaps
x x x x

 

[Arcanegirl]

Bold titles means theres unread posts in the topic

 

[princessttc]

thanks heaps
x x x