Twitoria is a nice Twitter app that allows you to discover which of your friends have not been active on Twitter for a given period of time. Twitoria allows you to see all inactive friends for the past week, past two weeks, past two months, past six months, or for the past year. A nice tool for cleaning up your Following list.
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I don’t mind keeping inactive people but I hate keeping people who are not following me or people who spam tweets. It’s better to unfollow them who are not following you or do tweetspam.