We’re holding off publishing our social commerce trend predictions for 2011 – but there’s widely tweeted set of 4 social media tend predictions circulating of note from the Gini Dietrich, CEO of digital marketing firm arment dietrich. Group-buy and Facebook e-commerce figure prominently.

1. Social commerce. Social who? In short, you can now sell on Facebook by letting your customers buy, but also letting them tell their friends. And letting their friends tell their friends. Even if you don’t offer ecommerce on your website, it’s now possible to provide that service through the social network. And it’s overly simple to set up.

2. Group buying. You’ve heard of sites, such as Groupon, that sell for discounts if you get your friends to “group” together to buy a product or service? Based on the $1 billion price tag Groupon received earlier this year, expect them and like-minded sites (such as LivingSocial, YouSwoop, and ScoutMom) to continue to grow, offering you a new way to reach different audiences.

3. Q&A sites. It may seem crazy if you’re not a high user of the social platforms, but people are beginning to make real decisions based on recommendations from their virtual friends. Sites such as JustAnswer will begin to pop up, allowing people to ask a question and get real answers, from real people. The marketing possibilities become endless because you’ll begin to collect data from groups of people instead of one customer at a time.

4. Mobile. It’s no surprise our phones are becoming like third hands for most of us or that we’re eons behind Asian countries on how we use them. But we’re beginning to catch on and move toward abandoning our laptops for phones. Watch for movement toward mobile payments and begin thinking about how to accept payments via an application on the phone.”

In addition to these four social media trends, Gini Dietrich adds four more general communication and marketing trends for 2011 (1) content, content, content, 2) FTC rulings, 3) Net Neutrality, 4) Customer Engagement) – and promises four more.