stackoverflow.com就不介绍了，一种解决方法就是手动分析链接，使用nslookup得到hosts：
#stack overflow 198.252.206.140 cdn.sstatic.net 190.93.246.58 cdn-careers.sstatic.net 198.252.206.17 careers.stackoverflow.com 198.252.206.140 stackoverflow.com 198.252.206.140 www.stackoverflow.com 198.252.206.140 stackexchange.com 198.252.206.140 www.stackexchange.com 68.232.44.251 static.adzerk.net 203.190.124.28 pixel.quantserve.com 54.243.104.88 stack.imgur.com 54.243.104.88 i.stack.imgur.com 198.144.96.59 scorecardresearch.com 198.144.96.59 b.scorecardresearch.com 184.85.171.120 sb.scorecardresearch.com 209.116.151.162 edge.quantserve.com 198.252.206.21 stackauth.com 199.193.114.165 ssl.mousestats.com 173.194.70.95 ajax.googleapis.com
把这些内容追加到 /etc/hosts 即可，搜索结果中打开 stackoverflow.com可以秒开，打开 careers.stackoverflow.com 就无能为力了，会稍微慢一点。