Even as fewer “buy now” and “add to cart” buttons sprinkle Facebook’s newsfeeds and apps, US retailers know the importance of being on the site. The question is whether or not retailers can crack the commerce half of social engagement. According to the e-tailing group, 98% of US ecommerce merchants surveyed had a Facebook page in Q4 2012, and nearly the same number of respondents (97%) linked to Facebook from their site. It is also notable that sharing in general is on the rise - a tactic growing in popularity as social discovery becomes a bigger part of the shopping process. Whether or not internet users go on Facebook with the intent to shop, it was the social network most likely to influence purchases among US internet users surveyed by Technorati in December 2012. Facebook nearly tied with blogs, at around 31%, and trailed only the more sales-focused brand and retail sites. The same study found that 21% of respondents followed brands on Facebook to make purchases. Get the full story at eMarketer