I thought I was so cool pontificating on it when I was 15. Then I looked at it at some point in college... Dear God it was barely legible. I mean it was bad. More 2000-style internet abbreviations and text smileys than actual words.
It was totally better than Facebook though, because you got to read what your friends were really thinking, and they read yours. Friends on Xanga were really your friends. Or your frenemies. Nowadays people aren't willing to read more than a sentence before they get distracted.