The hashtag. It entered our vocabulary in 2007, and has now achieved permanent status in our lexicon with Twitter’s IPO. (That is, Twitter has just become a publicly traded company on the New York Stock exchange—you can own a piece of a tweet!) As of this writing, the price of Twitter stock seems to be holding steady—although investors were spooked by the mess Facebook made of it a little over a year ago. In a nutshell, Twitter is here to stay.
You can see a pretty infographic about the hashtag here: http://socialmediatoday.com/irfan-ahmad/1897096/history-hashtags-infographic
You can learn to use hashtags on Twitter in your job search (with info for college students) here:
And more in depth, more sophistication, here:
And here’s a list of hashtags and what they can get you: