In most lines of the following text, there is one unnecessary word. It is either grammatically incorrect or does no fit in with the sense of the text.

Cyber litter

1. Upon discovering the joys of backpacking. Leeanne Barr
   she
   she
   decided to
2. set up a web site featuring the various regions she had visited. For the
3. next three years, Leeanne
   really
   really
   conscientiously updated her site
4. every time she returned from another
   one
   one
   trip. However,
5. Leeanne's life took
   up
   up
   another path - she got married - and her
6. days of travelling came to
   finally
   finally
   an end. This meant that
7. she had nothing new to post on her web site. This is nothing unusual;
8. unlike
   unlike
   those who set up personal web journals and blogs,
9. as they are referred to in computer jargon, often lose
10. interest in their sites when their lives change. According to
    recent
    recent
11. one study, conducted to determine
    if
    if
    how many blogs
12. on the World Wide Web were
    being
    being
    abandoned or out of date,
13. two-thirds had not been maintained for over two months
14. and a quarter
    of
    of
    had been created by some enthusiast,
15. never to be visited again. So what does all this mean for the
16. average computer user? As cyberspace becomes increasingly
    that
    that
17. cluttered with 'dead wood', users will find it more and more difficult
18. and tedious to
    soon
    soon
    find the worthwhile web sites.