The # symbol, a hashtag, is used to designate keywords or topics in posts. It was created by users as a way to categorize messages. It is now used across other networks including YouTube, Facebook, Google+ and Instagram.

Hashtags (#) make it possible to view messages across each social media platform, which include that #tag in the message.

Videos and other posts may be tagged by putting #tag  (the tag part is what you will select) at any part of the post.  Here is an example:  Try a great #mystery novel today 

People use the hashtag symbol in their post to help them show more easily on social platforms. Large volumes of searches are performed across the world for individual #tags. This allows people who are not connected to see vidoes on a wide range of subjects. #Tags are used extensively for events, politics and TV shows, as well as more general topics.

If you post with a #tag on a public social media account, anyone who searches for that hashtag may find your post. Please don’t over use #tags. No more than two #tags per post, please.

Please also use #tags only on tweets, posts, and messages relevant to the subject.

A list of ten relevant #tags for writers:

#amwriting – for when you are writing – to connect with others writing

#askagent – to ask any literary agent for advice

#books – to designate a book

#eBook – to designate an ebook

#fridayreads – to show a recommended book on any Friday

#mystery – to say your book is a mystery novel

#read – to recommend a read

#romance – to say your book is a romance novel

#suspense – to say your book is a suspense novel

Please use this free #tag search site to see the relative popularity of any #tag and search for similar and perhaps more popular #tags: https://hashtagify.me/