Anyone who's ever mentioned an Apple product in a tweet has probably been on the receiving end of a torrent of replies from spambots. Oh the humanity. Fortunately, Twitter makes it easy to report spam—and other, more serious abuses.
To report an abusive tweet, go to the tweet in question—either through a direct link to the tweet or by finding it in your Twitter timeline or another user's profile page—then look for the More button in the lower left corner of the tweet and click it. You may need to hover your mouse over the tweet for it to show up.
You probably shouldn't report a tweet on Miley Cyrus just because you're sick of hearing about her twerking escapades, but if you were going to, this is how you'd do it.
From the resulting menu, select Report Tweet. Twitter will pop up a box asking you to specify whether the tweet is spam, whether that person's account was compromised, or whether it violates another rule ("Abusive").
Select the appropriate button, select whether you want to block and unfollow the account in question, then press Submit. If you selected "Abusive" from the list, the Submit button changes to a Next button, and Twitter will ask you for additional information on why you think the tweet is a problem.
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