The simple answer is yes. However, it is critical to understand what a hashtag does.
A hashtag—written with a # symbol—is used to index keywords or topics. They were first developed for Twitter but are now a broader indexing tool. It allows people to follow topics they are interested in quickly. That topic (hashtag) is the most searched when something is trending. In other words, it helps you navigate an ocean of content and is a quick tool for people to find you.
Don´t abuse them, though old-school trending hacks were to jump on popular hashtags even if they had nothing to do with your content or message. This doesn´t work as people will ignore you and, even more detrimentally, not trust you.
But smart use of hashtags helps people find you. So don´t just ignore them.
Number 1 in my series of ´tips & tricks´ in the world of online marketing.