Sorry Janeainsworth! I think perhaps 'controlled' was not the right word. I meant 'succinct'. No offence to anyone intended.
We all get the odd nasty comments or get criticised for what we say that doesn't please others from time to time, but that is the penalty to be paid for going public on social networking sites, isn't it? Choose what you post and what you respond to carefully. Trolls or anyone you don't want following you can be blocked though. And there are privacy settings.
The more we post, the more we lay ourselves open to criticism. I have noticed it happens on the Gransnet forum too, doesn't it? To avoid, you can always just lurk and not post. Twitter can still be a great source of info or entertainment. Just choose who you follow, and allow to follow you, carefully.
Oh yes, and re: the addictive nature of Twitter .... it is! I try to keep to x2 a day!!