Thats not a misspelling, hashtags, and hashflags are two different things.
What is a Hashflag?
Theyre added by Twitter and users can use only those, that were allowed by the service.
Vladislav Mashirenko
Once added, some hashflags disappear, while others keep on existing.
And then added them once again on World Cup 2014.
But there are also companies or events Twitter creates non-profit hashflags.
How to use hashflags
All Twitter users can use hashflags.
It works the same way as with hashtags.
