Former Republican U.S. vice presidential candidate Sarah Palin is back on Twitter.

She began using the social networking site earlier this year, where she tweeted about Alaska state government, U.S. politics and other matters.

When she quit as governor in July, she promised she would keep tweeting.

But that didn't happen -- though she did touch base with fans on her Facebook page.

Now, Palin says she will provide Twitter updates from her book tour.