Yes it is. Why are you asking?
Specialized search engines indexes content specialized by topic or location and are used to deliver more relevant results to the user. It indexes pages for particular topics. Examples of specialized search engines and their applications include;
1. Uquery.com – This new search engine focuses more on the emergence of iPhone and iPod touch applications
2. Taptu.com – A downloadable search engine that helps the user find items specific to fit on a mobile screen
3. Yahooligans – A sub-domain of yahoo that focuses on kid friendly games.
4. Pubmed.com – This is specifically meant for students in medical schools
5. Zillow.com – Online real estate service that provides information regarding home purchase.
Answer: Doxing
Explanation: Doxing which is also referred as doxxing is defined as the revealing or publishing of the private records or information to the public.It is considered as the illegal practice which is base on the the internet service.The publicizing of the private data or confidential information is punishable offence.
Other options are incorrect because filtering is the elimination of the not required content, spamming is the activity of sending undesired bulk messages and hacking is the attacking of the system using false means to corrupt and steal data.Thus the correct option is doxing.