Hashtags believed to have originated on Twitter but, interestingly enough, it is not a Twitter function. Some believe it began when the broken plane luckily landed in the Hudson River in early 2009, some Twitter user wrote a post and added #flight1549 to it. I have no idea who this person was, but somebody else would have read it and when he posted something about the incident, added #flight1549 to HIS tweet. For something like this, where tweets would have been flying fast and furiously, it wouldn't have taken long for this hash tag to go viral and suddenly thousands of people posting about it would have added it to their tweets as well. Then, if you wanted info on the situation, you could do a search on "#flight1549" and see everything that people had written about it.
For further clarification on hashtags and for everything for everything else Twitter please visit: TwitterFanZone.com
"Wegmans didnt have MY kind of Organic Milk, so i had to by that silk shit instead #whitegirlproblems"
"Going car shopping today because my last car caught on FIRE #nbd