What is Web Bugs?
General definition: Web bug is any HTML element especially image which is created for two purposes: (1) implicitly embedded in the web page and (2) trying to collect data from users. Specific definition: a web bug can also be defined by its following properties: • Image’s domain name is different from the URL’s domain name: the element has this property when the two right most dot-separated components in the URL (or two highest DNS levels) are different. For example, the website www.cmu.edu is different from www.mit.edu because the two right most component (cmu.edu and mit.edu are different). On the other hand, www.cs.cmu.edu doesn’t have different host name from www.cmu.edu because their two right most are the same (cmu.edu). • Image size is less than or equal to 7 pixels: there is no useful purpose of using an image which its size is very small (less than 7 pixels). One possible reason is using it for justify the alignment of the web page. We can filter out this false positive by usi
