U.S. social media advertising spend is expected to grow 31.6 percent in 2013, reaching $4.2 billion by year-end, predicts eMarketer, and a new study has revealed some of the tactics used by marketing professionals.

Forrester Consulting surveyed U.S. advertisers and found that more than seven in ten (73 percent) cited the use of branded pages on platforms such as Facebook and Twitter as their primary social marketing tactic, ahead of buying ads on social networks (56 percent), micro-blogging (52 percent) and paying to promote content (51 percent).

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