I prefer forums for learning and sharing. digitalpoint and V7 forums are 2 of my favourites. Here's a link to a good collection of marketing forums: goodcontentwebsites.com/top-marketing-forums.htm
Hi everyone.. Internet marketing, also referred to as i-marketing, web-marketing, online-marketing, Search Engine Marketing (SEM) or e-Marketing, is the marketing of products or services over the Internet. The Internet has brought media to a global audience. The interactive nature of Internet marketing in terms of providing instant response and eliciting responses, is a unique quality of the medium. Internet marketing is sometimes considered to have a broader scope because it not only refers to the Internet, e-mail, and wireless media, but it includes management of digital customer data and electronic customer relationship management (ECRM) systems. http://www.mytwitteradder.com
I like Buzzblogger.com, tommiepowers.com, iblogzone.com, problogger.net, creativeprofiteer.net, dragonblogger.com, entrepreneurs-journey.com. Sometimes I'll read Mashable.com. What else? Oh! Quickonlinetips.com. That one has some very good tips in it. And so does blog.theideashome.com and freetraffictip.com