Novel Publicity provides a list of top hashtags for writers to use on Twitter:

2. #amediting – …and this is for when you’re editing your work.

3. #askagent – Some agents will answer questions that are tagged with this. You are following agents, right?

4. #fridayreads – So you can tell people what you’re reading. Happens every Friday. This is a great place to get your name out if you can get friends and fans to tweet your book as a Friday read.

5. #WW – This can mean a couple of things, but for the literary types, it means “Writer Wednesday.” This is sort of like Follow Friday. Name some of the writers you follow and tag them up. Some will even return the favor.