在社交网站上关注品牌的原因，认为是为了获得更多的促销优惠和产品信息的人最多。
The most popular reason for people to follow brands on social networks is to find out about promotional offers and sales.
广告商正涌入微博，邀请名人推广他们的产品、分发优惠券或散布促销活动。
Advertisers are flocking to microblogs, asking celebrities to promote their products or distributing coupons or promotions.
上周，在社交地图网站Loopt上下载iPhone应用程序的手机用户留意到维珍美国航空的一项优惠产品。这是该航空公司针对飞往墨西哥航线上的新服务举行的促销活动。
Last week, some mobile users who downloaded an iPhone app from the social-mapping network Loopt found out about a special offer from Virgin America promoting its new service to Mexico.
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