I then find it ironic that it is using #hashtag in the movements name then.
However I have a strong feeling that I modified/used hashtags (as tagging, not as a channel) back in 2005/6.
I think I got the idea from another system (probably some early wiki) but I'm unable to recall now.
I would guess it was inspired by IRC, the first popular chat system, dating back to the 70s or 80s, which uses channels named with the hashmark and which are often named after the conversation topic
http://factoryjoe.com/blog/2007/08/25/groups-for-twitter-or-...
https://en.m.wikipedia.org/wiki/Fragment_identifier#Basics
#Basics
Up until this point, I was pretty sure Facebook wouldn't end up going the direction of MySpace -- partly because there's not a perfect/better alternative (as Facebook was to MySpace) and partly because Facebook has subscribers that I never saw with MySpace[1], and there are increasing numbers non-Facebook things of things tightly coupled with Facebook[2]. At this point, however, the needle has moved quite a bit. There's clearly a massive market for this; and unfortunately, Facebook has everyone on it, which is the product to most people. Starting up a similar social network -- even with amazing features that Facebook lacks (I can't think of any) won't bring people in if the rest of their family, friends, the HS crush they want to stalk, etc aren't there.
Personally speaking, since leaving Facebook, I don't feel like I lost anything. Of the large friend list that I had, there were a small handful that I knew in real life; the rest were acquaintances or people from my past that were it not for Facebook I wouldn't have been terribly interested in having conversations with. Of the small handful, they were there before Facebook and are there after Facebook. It wasn't lost on me that of that friends list, nobody on the "I used to know you/barely know you" ever became a good friend and outside of my volunteer team, very few of the "people I knew in HS/previous jobs/otherwise used to associate with" ended up being people I saw in person.
I did feel like I gained a lot by leaving, though. No more inane posts from people thinking their 40 word status update is going to make me say "Oh, my goodness! All of my political beliefs are wrong. Thank GOD I read your incredible rant about (some dumb politician)" (and other forms of political masturbation), or stupidity like "dial 46 instead of 911 on your cell phone" and other urban legends posted by elderly friends along with their immediate replies linking to Snopes. All sorts of wasted time was reclaimed.
Unfortunately, this would probably have been the perfect* time for Google to launch Google+ and aggressively mine gmail users to create a friends list. I don't think dusting that off at this point would help, especially since a lot of the folks I know who are sour on Facebook feel the same way about Google these days, but it's a tough spot for anyone outside of them to fill adequately.
[0] I was never terribly happy about the privacy thing, but if you value privacy there's a whole lot of the internet you won't use. I left after receiving an angry phone call from a family member because I failed to "like" a picture ... once I became socially obligated to use Facebook in a specific manner, I decided it wasn't worth it. Between that and a somewhat recent announcement -- at the time -- that they'd begin linking stories you read around the web to your account despite you being logged out, I'd had it.
[1] My parents, aunts and uncles had barely heard of MySpace outside of scare-pieces that landed on the local news, let alone considered getting accounts. They're all on Facebook. The volunteer team I led for 5 years which consisted mostly of retired individuals all had Facebook accounts. Ask them about Twitter, Instagram, etc and it feels like I'm talking about MySpace again.
[2] There are services I can't sign up for and groups which have nothing to do with the Internet that I will not show up on their members list and have to rely on my wife to get updates from because that's the only place they provide information.