as many as you want, if your do 100 awesome tweets its better than 10 rubbish ones its all about quality
it depends on your are post if you promoting your site than you can post 10-20 and if posting story or news than no limit for this.
can i post news copied from other site with link and ad my site the seme time ? i mean i post over 20 one day ?
About 5 to 10 a day . Unless there are new ideas and all. More than that and people may thing you are spamming
Did you mean to say that 10 awesome tweets are better than 100 rubbish ones? Because of course 100 awesome tweets will be better than any number of rubbish tweets beneath it in number
I went through a training with social media expert David Steel and he suggested at least 5 per day. Interacting is recommended so you're not just talking about yourself. Join the conversation and say something relevant.