If you're using Twitter to connect with other writers or readers, you may want to consider using hashtags (but not more than two or three per tweet, or it gets difficult to read). Below is a list of the ones I use, or consider using.
What Are Hashtags?
Hashtags are words or expressions preceded with a # symbol. When used in a tweet, they become a link, or a search word, which leads to a list of all the tweets using the same hashtag. This is very useful to connect with like-minded people or to follow a conversation.
For example, if you want to connect with other writers in the process of writing, you may use the hashtag #amwriting (my personal favorite; try it now!); if you want to connect with other self-published authors, you may use #IndieAuthor, and so on. Every Tuesday at 9 p.m., children's writers use the tag #kidlitchat to talk about a specific topic related to children's literature. To be part of the conversation, just use the same tag in your replies.
Hashtags are not case sensitive, but capital letters may be used to make them easier to read, especially long ones (compare #bookreview with #BookReview).
I made a list of hashtags I consider using, then I went on www.hashtags.org to test how often they are used in a twenty-four-hour period and noted the maximum number of uses per hour (approximately) next to each hashtag.
This website is extremely useful in deciding which hashtag to use, as some are very similar but return different results. For example, when I tested #IndieAuthor, it returned a maximum of 50 per hour, as opposed to just #Indie, which returned 340. Of course, #IndieAuthor is more specific. #Indie could refer to musicians, artists, authors, etc. Sometimes it's better to reach a smaller but more specific audience. And the results may vary every day, but it gives an idea.
I started with a very long list, but I eliminated the ones that hardly anyone uses (according to hashtags.org).