why do some words appear in blue on the discussions?

United States
October 23, 2006 10:16pm CST
Enlighten me...
2 responses
19862004
@19862004 (430)
• India
24 Oct 06
thyat is the link or tags of other discussions.
cuddlebug79705
@cuddlebug79705 (2003)
• United States
24 Oct 06
I believe it has to do with words that have been tagged in that discussion.