then get serious about blogging.
From the Harvard Business Review:
Writing is still the clearest and most definitive medium for demonstrating expertise on the web. But as thought leaders like Gary Vaynerchuk have shown with video blogging and fellow HBR blogger Mitch Joel with podcasting (i.e., audio blogging), as long as your content is rich and thoughtful, you can still build up a massive following and reputation regardless of your channel. In an information-hungry world, there will always be a need for expert content. And there will always be more readers and "retweeters" than there will be creators.
If you want to have an impact, you might as well be the one setting the agenda by blogging your ideas.