My aim in this post is not to give you every hashtag that writers use, but to provide you with a functional list of the most common, and therefore the most valuable.
Hashtags for connecting with other authors:
- #AmWriting
- #AmEditing
- #WordCount
- #WriterWednesday (or #WW)
- #WritersLife
- #PoetTues
- #IndieAuthors
- #NaNoWriMo
- #WritingPrompt
- #Creativity
- #WIP (work in progress)
- #WritersBlock
- #WritingTips
- #WriteTip
- #WritersTellMe
- IndieAuthorsBeSeen
Hashtags for identifying and connecting with other bloggers:
- #blog
- #blogger
- #blogging
- #bloggerswanted
- #bloggersrequired
Hashtags for connecting by genre:
- #Romance
- #SciFi
- #KidLit
- #PNR (Paranormal Romance)
- #MGLit (Middle Grade Lit)
- #MemoirChat
- #FlashFic
- #Romance
- #Horror
- #FanFic
- #YA
- #History
- #Poetry
Hashtags for connecting with publishing colleagues:
- #GetPublished
- #BookMarket
- #BookMarketing
- #PromoTip
- #SelfPublishing
- #SelfPub
- #Publishing
- #AskAgent
- #AskAuthor
- #AskEditor
- #EBooks
- #IndiePub (or #IndiePublishing)
- #BookMarketing
- #PubTip
Hashtags for connecting with readers:
- #books
- #bookworm
- #FridayReads
- #BookGiveaway
- #MustRead
- #ReadingList
- #WorthReading
- WhatToRead
- #StoryFriday
- #TeaserTues
- #BookGiveaway
- #free
- #kindle
- #nook
- #iBooks
- bookslover
- bookspecials
- bookpost
- IndieBooks
- IndieBooksBeSeen
Hashtags for Instagram only:
- #writersofinstagram
- #readersofinstagram
- #poetsofinstagram
- writerscommunity
- #readers
Your own hashtag:
In addition to these, you can also make a hashtag for your own book or brand.
However, if you’re going to do this, make sure it’s unique to you or your book so that you don’t get lost in a haze of brand confusion.
You can see here that #jvlpo was good, but not good enough.
However, #jvlpoet was completely unique to me. I did this same search on both Twitter and Google when deciding on my domain name, jvlpoet.com.
WordyNerdBird 
Wow! What a great resource. Thank you for compiling this list.