Use the questions and answer feature of LinkedIn. LinkedIn's Q&A works like a large discussion forum: look up questions related to your products or industry and write useful answers to them. You could also post a link to one of your articles if you do not have time to write something.
YouTube has a huge and active user base and you need to be involved in it for successful social media marketing. Posting videos is a great way to get users involved, but you also have to be involved in the larger community as a whole. Posting comments and talking about other videos related to your industry will attract new users to your profile.
If you need to establish an email mailing list, using a social media site is a great way to do it. Get your followers and fans to provide an email address to you for future mailings in exchange for an entry into a contest where prizes and discounts will be given away.
Relax, it is just an online conversation. Email used to scare the pants off of companies who did not understand the good, the bad, and the ugly of the whole thing. Now it is the go-to communication channel. Social media is the new channel, and all you need to do is sit down and talk to your customers. It is what they want and what you need.
Don't worry too much about making your site perfect. While it is important to give the people a lot of information, don't let the fear of imperfection keep you from getting started. Just as in many things, you will need to learn a little as you go. Getting started is what is really important.
Remember that when you are using social media to market your business, you are communicating with people, not at them. The technology that people are using now and the way social media is designed is allowing your customers to communicate easier than ever before. You have to engage in this conversation and communicate with your customers in contrast to posting ad copy with a one-sided point of view.
Try to make it so that all of your social networking sites are connected with one another. This is good so that everything you say reaches your entire audience. A good example of this is changing your settings so that everything that you post on Twitter is automatically posted on your Facebook as well.
If you take the advice listed here to get up and running on Facebook, Twitter or any of the other social media sites, you will start to see results quite quickly. There is nothing as satisfying as watching your fans and follower numbers start to grow every time you log on.