Think of Twitter as a networking event where there are people you know and people you don't - and you can hear what they're all saying! Standing in the corner listening, but not talking to anyone won't win you any brownie points at all.
Read what people say and respond - retweet things you like and share blog posts you think others will benefit from or enjoy. Get into conversations, ask for help, help others - it's all part of being visible.
Your Facebook personal account should be kept for personal stuff, but your Facebook Page is a great place to build a community. However, remember that it's Facebook and, therefore, social. That means that the content you post must reach people on that level.
Post images, add a message to the image, don't sell at people, but do include your brand somewhere. Lots of text doesn't work so don't write long copy - even if you can! Try and stay topical and keep it light.
This is a business platform so you'll need to stay focused on business issues. Post information of interest to business people and, on LinkedIn, you can get away with longer content - people are looking for information and prepared to read to get it.
To get engagement use good headlines for your posts and updates. Be visible in the groups where your ideal clients are active and be helpful, it's an opportunity to show off your expertise.
Google+
This sits somewhere between Facebook and LinkedIn with lots of people who are interested in the latest technology in conversation as well as a wide variety of others.
The biggest asset is the Google Hangouts as they offer an opportunity to get into live conversations. Tip: Don't start one without a clear agenda, but be flexible and go with the flow. It's probably best to invite people before the Hangout goes live so you have an audience.
Image driven, but with a facility for up to 500 characters of text alongside each one. To really make an impact here you need to be posting very high quality, innovative, stunning pictures that will make people sit up and take notice.
The purchasing power on Pinterest is much higher than on Facebook so don't miss the opportunity. Think glossy magazine level images to be on target.
Of course, there are many more platforms - not least YouTube, Instagram, and Tumblr - and they have some clever little gizmos, like being able to load animated gifs and short video clips. However, if you get these on target, everything else will follow.
