Daniel Victor, writing for Nieman Journalism Lab:
Here’s where I’ll join the rest in unquantifiable hoodoo: I believe hashtags are aesthetically damaging. I believe a tweet free of hashtags is more pleasing to the eye, more easily consumed, and thus more likely to be retweeted (which is a proven way of growing your audience). I believe for every person who stumbles upon your tweet via hashtag, you’re likely turning off many more who are put off by hashtag overuse. We need not banish the hashtag, but let’s start putting more thought into when we’re using it.
It's abuse, plain and simple. I wholeheartedly agree with Victor here.