When having a Twitter #hashtag chat, if you want to avoid overwhelming your followers, start any tweet you want to “hide” with @HideChat or (one character shorter) @HideTag. (Do NOT follow @HideChat or @HideTag. They exist only to help you hide your Twitter chats.) NOTE: This also works when live-tweeting events or shows.
You don’t need to do this with all your chat tweets (though you could). But it’s a good idea to do it with mostof them so as not to overwhelm folks. You could also use this for conversations with someone that you didn’t want others to notice in your timeline, although direct messages would work best for that.
Go to this link for the most popular 2012 educational hashtags: http://edudemic.com/2012/06/2012-twitter-hashtags/