I think the twitter is more easy to use than the blackboard and blog. But the twitter only type like two sentence.The blog can type the whole page.The blackboard is like the old style system.I still like to use the twitter and it is east to connect with friend and share something ASAP with friend.
I follow the facebook and the northface. They are post the main ponit of their company and AD.
i liked blog more than twitter because as you said twitter only gives you a certain number of characters to write,but blog has no limitations
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