If you're just getting started with a social media and inbound content marketing campaign, you'll want to begin by thinking about a distribution platform plan.Not sure which platform to to focus your efforts on? Let's start with a bit of Digital Marketing 101.Just what is a distribution platform? For social media, Forbes defines a distribution platform as a channel that helps in, ". . . building a brand image for your business, for listening and gathering insights, and for finding and engaging with prospects and customers; this marketing strategy works best when integrated with other marketing tactics."Now that we have an idea about what a social media distribution platform is, let's take a look at the top four platforms for B2B and B2C marketing in North America.