Bradley Chambers thinks hashtags are abused on Twitter:
My single biggest annoyance with Twitter is when people overuse and misuse hashtags. Below are acceptable (in my opinion) uses of hashtags on Twitter.
Good tips by Bradley; the overuse of hashtags annoy the hell out of me too. I rarely use them.
The biggest offender, to me, is not Twitter but Instagram. I see so many posts with at least 15–20 hashtags that it makes me want to gouge my eyes out. It looks gross and is really in bad taste.