There is no one right way to use Twitter.
In General:
- give credit to good content - retweet or say "via @soandso"
 - caveat: in general don't retweet people with private accounts unless you know they are OK with it
 - think of your readers: do they speak txt by default? If not, then spell things out, use proper punctuation.
 - if your idea needs more than one tweet, indicate that each tweet is part of a group, with something like (cont) or (1/3) so that people reading "down" know there's more to the story.
 - it is OK to lurk and to not follow people back from a personal account
 - if you make your account private, be prepared to not have people follow you
 - don't get bent out of shape if people don't read everything you post.
 
- doing nothing but complaining / venting
 - using Twitter just to promote your blog
 
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