________ agencies specialize in endorsement of brands in the various social media platforms like blogs, social network sites, Q&A sites, discussion forums, micro blogs etc.

Advertising vs Sales Promotion: Advertising is done to build brand image and increase sales, but Sales Promotion is used to push short-term sales. Advertising is one of the elements of promotion while the promotion is the variable of the marketing mix. Advertising has a long term effect but at the same time promotion has short term effects.