The term opt-out refers to several methods by which individuals can avoid receiving unsolicited product or service information. This option is usually associated with direct marketing campaigns such as e-mail marketing or direct mail. A list of those who have opted out is called a Robinson list. Telemarketing The U.S. Federal Government created the United States National Do Not Call Registry to reduce the telemarketing calls consumers receive at home. Initially numbers listed on the registry were due to be kept for five years but will now remain on it permanently due to the Do-Not-Call Improvement Act of 2007, which became law in February 2008. The UK's Direct Marketing Association operates a voluntary opt-out scheme through the Telephone Preference Service, which was established in 1995. While the service will reduce unsolicited calls it does not stop solicited calls, market research calls, silent calls or overseas calls. Canada's National Do Not Call List operates an opt-out list which allows consumers to register their wishes not to have telemarketing calls. Charities, newspapers, and pollsters are exempt although each of these is required to keep their own do not call list that consumers can be added to at their request. Australia has a national Do Not Call Register. The Australian Communications and Media Authority (ACMA) is responsible for the register under the Do Not Call Register Act 2006. In order to be included on the register, a telephone number must be used or maintained primarily for private or domestic purposes, or exclusively for transmitting and/or receiving faxes. Government body numbers and emergency services numbers are also able and numbers can be removed at any time. E-mail marketing In e-mail marketing, a clickable link or "opt-out button" may be included to notify the sender that the recipient wishes to receive no further e-mails. While 95% of all commercial e-mails from reputable bulk emailers with an unsubscribe feature indeed work in this manner, unscrupulous senders and spammers can also include a link that purports to unsubscribe a recipient; clicking the link or button confirms to the originator that the e-mail address used was a valid one, opening the door for further unsolicited e-mail. Online advertising Targeted advertising and behavioral targeting are a series of technologies and techniques used mainly in online advertising to increase the effectiveness of advertisements. By capturing data generated by website and landing page visitors, advertisements are placed so as to reach