said 1 year, 5 months ago:
i tend to advise clients and follow the rule that planning is key but to be on top of your game you need to be reactionary too.
In terms of planning, look at the calendar of events through the following month and sit with a blank posting template, e.g. if you know you are going to say something particular around valentines day next month schedule those messages in now so even if you are busy they go out.
I would say 70% of my tweets and posts are planned (saves a lot of time) and when done properly and monitored you can still appear to be online all the time, invest in a mobile device that will give notifications as and when people interact with you and you will have it covered.
For the record on a daily basis i manage 5 twitter accounts, 101 Facebook, 3 YouTube, 2 Google Plus and write for and manage 4 blogs
hope this helps