I was surprise to see My host file size grew from 1 KB to 299 KB. The main culprit was Spybot search and destroy. Here is the list from my host file, You can see how many entries were added. I was lucky since I had installed Webroot Spy Sweper, It blocked all access to these site, otherwise I would be getting some heavy trojans and viruses. BTW these were access network without my knowledge, Thanks Webroot.