Didymo is a member of the group of single-celled aquatic plants (freshwater algae) known as diatoms. Although it is microscopic, didymo can form dense colonies called algal blooms which can be seen with the naked eye.
From a marketing perspective, publicity is one component of promotion which is one component of marketing. The other elements of the promotional mix are advertising, sales promotion, direct marketing and personal selling. Examples of promotional tactics include: 1  Announce an appointment.
Propaganda is information that is not objective and is used primarily to influence an audience and further an agenda, often by presenting facts selectively to encourage a particular synthesis or perception, or using loaded language to produce an emotional rather than a rational response to the information that is presented. Propaganda is often associated with material prepared by governments, but activist groups, companies and the media can also produce propaganda. In the twentieth century, the term propaganda has been associated with a manipulative approach, but propaganda historically was a neutral descriptive term.