We’ve pulled together some of the most popular book marketing tweets, courtesy of bloggers, marketers, authors and others. The topics include how to use Google+ circles, where to get images to use on your blog, ways to grow your writing skills, and more. Happy marketing!

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* How to Market a Book & Strengthen Your Author Platform with Goodreads

Goodreads is a great site for author promotion, and the site offers a number of ways authors can market themselves:

http://www.yourwriterplatform.com/market-book-goodreads/

* 9 Ways to Grow in Writing Skills

Author Jody Hedlund offers 9 ways authors can challenge themselves to grow:

http://jodyhedlund.blogspot.com/2014/04/9-ways-to-grow-in-writing-skills.html

* Google+ Circles: Making them Work for You

If you haven’t done much with Google+ Circles, you’re missing out. Learn more:

http://www.indiesunlimited.com/2014/04/07/google-circles-making-them-work-for-you/

* Wonder How to Best Use Hashtags for Social Media Marketing?

TopRank’s Nick Ehrenberg explains the pros and cons of hashtags:

http://www.toprankblog.com/2014/04/hashtag-marketing/