This decision-making flowchart helps people decide whether to add a hashtag to a tweet, and how to find the most appropriate hashtag(s) to use. It enables people to avoid adding unnecessary, gratuitous, and potentially spammy hashtags to their tweets. Hashtags are less critical than many people assume, and using them inappropriately can actually detract from a tweet rather than enhance it. Plus, with only 140 characters to work with, precious space shouldn’t be squandered. A good rule to follow is: When in doubt, leave it out!