You can now use the $ on Twitter to turn stock symbols into clickable links.
The new feature came Monday afternoon when the company announced it in a tweet.
— Twitter (@twitter) July 31, 2012
The use of $ before stock symbols was already common, especially among those working in Wall Street-related fields, but by giving the symbol clickability, Twitter is making the practice more worthwhile.
From my use of the "cashtag," it seems the $ will only produce a link if it's used with an existing stock symbol. So the $ won't create a cashtag if you're just talking about specific amounts of money.
The cashtag follows in the steps of the @ and # signs on Twitter, which have been adopted on other social media platforms. On both Google+, Facebook and other sites, you can use the @ sign to link another user, and on Google+ you can use the # to form a hashtag.