看起来开心网挺不住了，朋友网刚开通，网站流量不错，不过用户在线时间不行。
跟开心网和朋友网比起来，人人网的用户在线时间最好。
开心网 http://www.alexa.com/siteinfo/kaixin001.com
Estimated percentage of global pageviews on kaixin001.com:
3 month 0.05843 -30.05%
Estimated daily unique pageviews per user for kaixin001.com:
3 month 14.54000 -20.7%
Estimated daily time on site (minutes) for kaixin001.com:
3 month 14.50833 -11%
1 month 13.70500 -8%
人人网 http://www.alexa.com/siteinfo/renren.com
Estimated percentage of global pageviews on renren.com:
3 month 0.08682 +18.32%
Estimated daily unique pageviews per user for renren.com:
3 month 10.19000 +1.8%
Estimated daily time on site (minutes) for renren.com:
1 month 14.89167 +11%
朋友网
Estimated percentage of global pageviews on pengyou.com:
3 month 0.03134 +50.5%
Estimated daily unique pageviews per user for pengyou.com:
3 month 4.78000 +1.1%
Estimated daily time on site (minutes) for pengyou.com:
1 month 5.93500 +3%
