Since Twitter introduced its advertising through its Promoted Tweets we've had questions from marketers about costs and whether the service would become available to advertisers with smaller budgets as is possible through Adwords, Facebook and LinkedIn.This leak gives an idea of the costs and suggests the program isn't likely to become available to small and medium businesses any time soon.Marketing implications of the Twitter feesWhile most marketers will continue to use Twitter as a low-cost way of engaging and building an audience, it’s useful to know that advertising isn’t an option -- if and when colleagues ask "why aren't we advertising on Twitter?"If you work for a larger organisation or agency with larger budgets available for this program, this raises questions about the value of a follower compared to other channels. While the cost appears expensive at first glance, it may not be in comparison to other channels like Adwords where someone who clicks on an ad is arguably less engaged. It will be interesting to see ideas and cases on calculating the value of a follower in the same way email marketers assess value per subscriber.Dave Chaffey is the CEO of Smart Insights
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