This is illegal under US federal law, unless the website asks for permission from a higher power. Some websites who have permission to do this, such as http://www.wikipedia.org, do this to make sure no vandalism or inappropriate content is placed on the website.
WikiAnswers Supervisors and Community Assistants can see all contributions by an IP address.
By your username and IP address.
Any question, answer, message, or discussion on the site has a record of the originators user name and/or IP address. Like almost all forums or sites, the supervisors are capable of doing a query on the IP address of the originator if it is necessary.
Information about you (e.g. your IP address) will be logged by WikiAnswers. If you ask or question (or do any activity that involves changing anything on WikiAnswers) your IP will be publicly visible on the question history.
Their username, or IP address, will be listed in the history of the question.
ID Names are users that have contributed anonymously, by using their IP Address. Supervisors do not see IDs, but see the IP Address of the contributor.
The A RECORD is the record that points a domain name to an IP. The MX RECORD is the record that points the email for a domain to mailserver hostname.
Every website you visit knows and records your ip address :P
There is no way to contribute to WikiAnswers entirely anonymously; when you contribute without an account, Supervisors and Community Assistants can view your IP Address for vandalism purposes. However, Non-Supervisors will not see the IP Address, but an ID Number instead.
Yes, answers by people who are not logged in are represented by the IP address they used at the time of the answer (this helps track vandals at the site)
Even before the layout was changed for WikiAnswers, same person could not rate one contributor twice from same IP address, as IP address is marked for one recommendation.
it is very difficult to answer