I don't Twitter.
I don't do much on Facebook or LinkedIn.
I don't have a Podcast.
I only mention this because I really believe that you can spread the word about your art without using every social media tool out there.
Pick one or two that you feel most comfortable using and that you can generate content for consistently and you'll be fine.
Remember . . . all these things are just tools. They are all just Big Shiny Hammers. Don't let tool selection distract you from the main job, which is create remarkable artistic content.
Here's a good rule of thumb for selecting social media tools:
Only use social media tools that you think you could be the best in the world at using.
I blog because I figure I have a reasonable shot at being the best arts marketing blogger in the world.
If you think that your dance company could write a blog on dancing that has the potential to be read by people all over the world then it is worth the time and effort it takes to get that done.
But PLEASE, PLEASE, don't start blogging or twittering or whatever just because someone told you that you had to do it to reach a particular audience.
Do it because you honestly think you can be world class at it. Or don't do it all and invest your valuable time and energy some place else.