Providing good information. They were usually made with the best of intentions. But the rules are more complex for different environments E-mail listservs, Newsgroups, chat rooms, other fora, Web page designs, multiuser environments, etc., all have specific rules for their use. Most provide guidelines to their proper use. Be sure to read those guidelines, or you are likely to be ostracized or refused access or membership.
Most people link to others' pages without asking.
A somewhat anal-retentive atitude is that one should always ask before linking to another's Web page. My assumption is that, if they have put their Web pages online, the probability is that they want someone to access them. Therefore, I don't ask. There are major exceptions . You should not create frame-type Web pages that make the imported Web pages look as if they are your own Web pages.