To paraphrase the immortal Tom Lehrer: Social Media is like a sewer. What you get out of it depends what you put into it.
The cornerstone of a great social media presence is creating content that people will want to be social with. This means it's worthy of liking, commenting on or sharing from your audience's perspective.
How do you accomplish this? Start by checking your ego at the keyboard. Write your post, then ask yourself what you would do if you were the recipient. Is what you're posting worthy of your attention? Would you like, comment on or share it? What could you do to make it more likeable, commentable, shareable? Putting it simply: mediocrity doesn't spread.
If your social media activities involve curating content from other sources, introduce that content with an attention-grabbing title. When you're posting a status update, add the most engaging appropriate image you can find to go with it. Why? Because people like pictures. Especially if they're of cute animals. I'm sure if I had a picture of a kitten in a sewer, this post would get more attention. Infographics are also a useful method of simplifying complex concepts and catching people's interest.
Being more engaging online starts with spiffing up your content and its presentation, but it doesn't stop there. If you want to be engaging, you have to be engaged. Watching for opportunities to contribute value, to add to a conversation or to share quality content can also make a difference. Position yourself as a valued contributor and source of information (like you are in the offline world, right?) and people will take notice.
And there's the key word: notice. If you want results, you need to be noticed - in a good way! Being engaging, knowing your audience and interacting when appropriate will put you on the path to getting the results you want from your social media efforts.