Is this illegal to copy the texts from one forum to another forum, as a reference.?

Answer 1

Not if what you are doing ammounts to "fair use".

Probably no one cares if you copy & paste into Yahoo Answers since you are not making a profit off of it, the amount of words that you are copying is probably just a small blurb, you are giving them free advertising, and people usually post stuff on the Internet because they are offering it for the public (usually the website has "terms of use" that tells you what the copyright owner will allow you to do with his words).

From the US Copyright office:
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Section 107 contains a list of the various purposes for which the reproduction of a particular work may be considered “fair,” such as criticism, comment, news reporting, teaching, scholarship, and research. Section 107 also sets out four factors to be considered in determining whether or not a particular use is fair:

1) the purpose and character of the use, including whether such use is of commercial nature or is for nonprofit educational purposes;

2) the nature of the copyrighted work;

3) amount and substantiality of the portion used in relation to the copyrighted work as a whole; and

4) the effect of the use upon the potential market for or value of the copyrighted work.

The distinction between “fair use” and infringement may be unclear and not easily defined. There is no specific number of words, lines, or notes that may safely be taken without permission. Acknowledging the source of the copyrighted material does not substitute for obtaining permission.

The 1961 Report of the Register of Copyrights on the General Revision of the U.S. Copyright Law cites examples of activities that courts have regarded as fair use: “quotation of excerpts in a review or criticism for purposes of illustration or comment; quotation of short passages in a scholarly or technical work, for illustration or clarification of the author's observations; use in a parody of some of the content of the work parodied; summary of an address or article, with brief quotations, in a news report; reproduction by a library of a portion of a work to replace part of a damaged copy; reproduction by a teacher or student of a small part of a work to illustrate a lesson; reproduction of a work in legislative or judicial proceedings or reports; incidental and fortuitous reproduction, in a newsreel or broadcast, of a work located in the scene of an event being reported.”

Copyright protects the particular way an author has expressed himself; it does not extend to any ideas, systems, or factual information conveyed in the work.

The safest course is always to get permission from the copyright owner before using copyrighted material. The Copyright Office cannot give this permission.

Answer 2

As long as what you're doing is not copying the complete text and you reference the material, you may "sample" up to 50 words from any text. Be aware though, if the originator disagrees with the way in which you're using the material, you will have to remove it.

Answer 3

for sure they carried out what they wanted...they were given you to react to them. you performed precise into their plans. why did not you in easy words ignore about them? they are going to ultimately get bored of you and worry some different person in case you do not renowned them

Answer 4

as long as you cite you source

Answer 5

Yes. As long as you give a source for your content, its OK.