How are sites like this http://bit.ly/88smk4 able to get data such as PR, Alexa, Backlinks e.t.c. for so many domains? If it is a script how can this kind of mass domain checking be done without getting banned by google e.t.c. Thanks in adavance...
As long as I know, they are using Google API Key, so that's why they are never banned by Google. CMIIW