Get out there!
Do something and do it regularly. Effective Social media relies on consistently providing snippets that engage and/or entertain. Providing these regularly ensures you are kept in the forefront of your readers awareness. They naturally remember you when your subject is mentioned.
Therefore decide that you, or your organisation, are actually going to do it, and be serious about it.
If you go into social media half hearted, you are wasting your time (and therefore money). If you only dabble, you are likely to get minimal results, you may make some interesting contacts and hopefully get the odd bit of business, but you are unlikely to get the fantastic results you have heard about and were hoping for.
References and Inspiration in 7 Habits of Highly Social Media – Intro