Manners mistress Emily Post wouldn’t recognize today’s social skills.

Communication styles have changed, with the once-mandatory handwritten thank-you note supplanted by a tweet or a family email blast. These days, good table manners are far less important than proper posting protocol.

The way in which retailers market to consumers has undergone considerable change in recent years, particularly in light of the popularity of social media platforms. Indeed, social media has become essential to retailers’ marketing efforts, according to a recent BDO USA survey, which found that 86% of retail CMOs included social media in their holiday 2012 marketing plans.

A lot has changed in the past year on the social media block. Facebook and Twitter are no longer the only two major players helping retailers connect and engage with their shoppers in real time. Consumers are flocking to platforms such as social-photo sharing sites Pinterest and Instagram, and some brands are even creating their own social blog accounts on Tumblr.

In recent years, specialty retailer GameStop Corp. has been among the fastest-growing global chains, opening 388 new stores in 2009, more than 350 in 2010 and 285 new locations last year. For its current fiscal year, GameStop is ramping down organic growth, anticipating the opening of some 150 stores, in deference to building on its dominant presence in the multichannel PC digital download market.

By Elizabeth Cogswell Baskin

Editor’s note: Launched in March 2010, Pinterest now ranks as the third most-visited social-networking site in the United States, according to a recent report by Experian Marketing Services. Pinterest, which lets its users “pin” photos and information onto virtual boards, ranks behind only Facebook and Twitter in terms of total visitors, according to the report. It also skews heavily female — about 60% of users are women.