A great post was made by @kevanlee about hashtags and social media, weather we should use hashtags or not. researches showed that in most social networks posts with hashtags get’s higher engagement rates than normal posts. bottom line:
Yes, you should use hashtags
Although, randomly using hashtags could and will harm your business content, with that being said; management hashtag tools to find and manage relevant hashtags to your content/subject became essential.
The question actually went from should we use hashtags or not to which hashtag should we use and how relevant these hashtags to our content,in addition to that, are these hashtags overused? will our content actually show in searches for these hashtags or will it be buried deep down?