Are you using Twitter? Twitter users use hashtagged (#) words or run-together phrases in their posts as a way to instantly identify the tweet's subject, providing search words or phrases interested people can easily find. Sometimes hashtags are used just to be fun and attract attention (#ILoveChocolate). For best practices (so your tweets don't look annoyingly overloaded), do not use more than three hashtags per tweet. Facebook now accommodates hashtags, too, as searchable terms, so you could use some basic ones in your Facebook Page's posts. However, most people on FB probably aren't aware of FB hashtagging or don't know what it means.

Here are 44 Essential Twitter Hashtags for Authors by Author Media.