Many times people confuse a #hashtag to a hyperlink as it kind of blends in the content. I feel its little irritating and an obstruction to the real content. Those who are deeply into social media feel otherwise.
Has anybody done some research whether the reader likes hashtags within posts. Perhaps you can say that the concept which started with Twitter is now also on Facebook and Google+ so obviously people like it.
Came across this article The Pros and Cons of Facebook #hashtags which covers the topic in detail with focus on Facebook.