Ad serving describes the technology and service that places advertisements on web sites. Ad serving technology companies provide software to web sites and advertisers to serve ads, count them, choose the ads that will make the web site or advertiser most money, and monitor progress of different advertising campaigns.
Cost Per Action or CPA (as it is often initialized to) is a phrase often used in online advertising and online marketing circles.
CPA is considered the optimal form of buying online advertising from the advertiser's point of view. An advertiser only pays for the ad when an action has occurred. An action can be a product being purchased, a form being filled, etc. (The desired action to be preformed is determined by the advertiser.)
Federal Trade Commission establish new rules beginning with December 1 for bloggers, forcing it to disclose any payment they receive for reviews. This applies for advertisers as well as for celebrities. The penalties are up to $11,000 for the violation of these rules. Richard Cleland, assistant director for the division of advertising practices at the FTC, said that "given that social media has become such a significant player in the advertising area, we thought it was necessary to address social media as well."
While FTC is a specific US institution, I do not understand how these rules will be applied to the bloggers belonging to other nations, that comply with their own nation rules. Besides, as stated by Rick Calvert, chief executive of the blogger conference BlogWorld & New Media Expo, there are "tens of millions of blogs, podcasts and other forms of new media content out there and growing every day," so it is difficult to enforce the FTC rules.

e-Mail marketing is a form of direct marketing which uses electronic mail as a means of communicating commercial or fundraising messages to an audience. In its broadest sense, every e-mail sent to a potential or current customer could be considered e-mail marketing. However, the term is usually used to refer to: