In the online marketplace, consumers can transact business without the constraints of time or distance. One can log on to the Internet day or night and purchase almost anything one desires, and advances in mobile technology allow advertisers to reach consumers nearly anywhere they go. But cyberspace is not without boundaries, and deception is unlawful no matter what the medium. The FTC has enforced and will continue enforcing its consumer protection laws to ensure that products and services are described truthfully online, and that consumers understand what they are paying for. These activities benefit consumers as well as sellers, who expect and deserve the opportunity to compete in a marketplace free of deception and unfair practices.The general principles of advertising law apply online, but new issues arise almost as fast as technology develops â " most recently, new issues have arisen concerning space-constrained screens and social media platforms. This FTC staff guidance document describes the information businesses should consider as they develop ads for online media to ensure that they comply with the law. Briefly, The same consumer protection laws that apply to commercial activities in other media apply online, including activities in the mobile marketplace. The FTC Act's prohibition on "unfair or deceptive acts or practices" encompasses online advertising, marketing, and sales. In addition, many Commission rules and guides are not limited to any particular medium used to disseminate claims or advertising, and therefore, apply to the wide spectrum of online activities.When practical, advertisers should incorporate relevant limitations and qualifying information into the underlying claim, rather than having a separate disclosure qualifying the claim.Required disclosures must be clear and conspicuous. In evaluating whether a disclosure is likely to be clear and conspicuous, advertisers should consider its placement in the ad and its proximity to the relevant claim. The closer the disclosure is to the claim to which it relates, the better. Additional considerations include: the prominence of the disclosure; whether it is unavoidable; whether other parts ofthe ad distract attention from the disclosure; whether the disclosure needs to be repeated at different places on a website; whether disclosures in audio messages are presented in an adequate volume and cadence; whether visual disclosures appear for a sufficient duration; and whether the language of the disclosure is understandable to the intended audience.