So, you may wonder: What’s a hashtag?
A hashtag is a word or phrase (with no spaces) that is prefixed by the “#” symbol. It is used to “tag” posts in social media sites, especially Twitter and Google+. Searching these sites for a hashtag will return a results page of “tweets” or posts that people have taken the time to identify as related to the hashtag.
So, for example, if you want to see who’s been tweeting in Twitter about direct mail, search for #directmail.
Here’s a link to a results page: https://twitter.com/search?q=%23directmail&src=hash
Of course, you can also search for the phrase “directmail” or “direct mail” (with or without quotes) and you will find different results. For example, if you search Twitter for the words “direct” and “mail,” your results will include tweets that include the words together and also apart.
The message here is this: search social networks for hashtags to discover what people are saying about a specific topic – like #directmail!