ok, the problem is when i search my web link on google data center its shows like this: Data Center # of Backlinks 66.249.93.104 274 Data Center # of Backlinks 64.233.179.104 274 Data Center # of Backlinks 216.239.51.104 274 Data Center # of Backlinks 66.102.9.99 274 Data Center # of Backlinks but one of my friend has this problem, i found error on google data center. as a result last week all his traffic from google missing. but when search on llink:hisname.com its show very nice index on google mostly 20,000 link. why are this thing happen to his site? or google block his site? or its a data center error? im using this tool to check http://www.seologs.com/dc-link-popularity.html