The last time I checked, the Top Ten Sites (other than Google) were... Facebook, YouTube, Yahoo, Live email, Wikipedia, MSN, BlogSpot, Bing, Microsoft.com and Ask.com...
The Society claims that JW.org gets 400,000 daily hits... I don't know if that's a good number of hits or not but this site is ranked somewhere around 7,500 !!!
Also, the reality is that most people don't turn on their computers to get their spirituality on, they go to their neighborhood church or turn on their TVs Sunday morning. That's plain reality.
If the WT really want to broaden their internet presence, they sure have a L-O-N-G way to go...