They really do just connect pictures/topics that are similar with one another.
But it's more the fact that you'll have these basically run on sentences that are one word because for it to be a hashtag... it has to be one word. So if I was to write this as a hashtag - I Won't do it as it'll drive me insane.... (haha, not really, but close enough) it'd just be one run on sentence... (best way my tired brain can think to explain it - so glad our leaving time got postponed by an hour - sure getting there an hour later than we originally were, but hey, more sleeping time.

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---------- Post added 11-02-2014 at 06:45 AM ----------
I rarely use hashtags... (but there are times that they make me laugh - situation depending...) This was a twitter post that I first had written to one of my deaf friends (she got a kick out of it don't worry, I wouldn't have done it if I didn't think she'd find it funny).
How is it that headphones, specially earbuds, are so tangled every time you want to use them? #hearingpeopleproblems
Because she doesn't have that problem.

:P It's only something that those who are hearing have to deal with. ;) But other than that, honestly I really don't use them ... like hardly ever.