That is done by sending a message to the person and/or posting on the question's discussion page. Placing it on the answer itself is not recommended.
Web answers
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Yes, sky.com does have a board to post complaints. There should be a forum at the right side of the main page. You can also contact them at their contact infor at the very bottom of webpage.
You can post an answer by finding a question you know that isn't answered and that you have the answers.
The Post Office has a website so I would think there is a menu item for complaints.
There are many places where you can share complaints on the web. This will depend on the type of complaint. If it is about a product or service, you can post on some forums that allow reviews from consumers.
It depends on who answers the questions, because most people can be trusted to post correct information, but others may post answers that are not true.
No, Answers does not post the questions on Facebook.
Answer does post things that people post. This is a website.
You can put links in your answers or in the sources.
People who know or think they know post answers the same way you post questions. Click on the Answer tab and see for yourself.
You are allowed to post legitimate answers on Answers.com. Legitimate answers are encouraged! Answers that aren't up to snuff, however, will often be edited or removed.