From Source: Mashable
In the era of social media, our networks are much larger than they have ever been, and we have more ways to communicate with those in them. Even if you are not very active on Facebook or Twitter, my guess is that your sphere of communication has expanded significantly in recent years. Who you communicate with and how you communicate has changed radically. This new connected era brings both opportunities and challenges.
In the past we had a set of contacts, all of whom generally knew how to reach us — via phone, e-mail, or regular mail. Today, thanks in large part to social media, we have many different levels of communication, each with a specific purpose and etiquette. When we do not understand the role of these levels, they can become huge time wasters. When we do understand them however, they can help us more effectively engage and navigate these new waters
It's Mashable, so you know you're getting a solid list. This list has less to do with the social media side of things we've come to know, and more to do with real-life communication tips. Study it - it could help.