I try to stick to these guides when I am going out with status updates;
1. Keep in a conversational tone
2. Ask a question
3. Keep it to two sentences max
Benchmarks of success
Comments on a status updates
For branded pages a percentage of 0.5% of your fans commenting back is the average anything that gets 1% or higher of your fans commenting back is an amazing result.
You are going to lose fans after every status update managing the level of unsubscribes is important. An unsubscribe rate of less than 7.5% is good.
Examples of good Australian Branded Pages
The Contender Australia/The Population
Gif via Brown Cardigan