Passwords are slowing transforming into passphrases: several words packed together.
Bruteforcing them is not an option, since their length could easily be longer than 12 chars.
The only option is to use a dictionary and start combining the words, however we could miss some "slang" words. The best way is to actually gather some real world phrases using Twitter hashtags.

First of all copy the file settings-dist.json to settings.json; we'll need it later to store some details.

Then install the requirements using pip:
pip install -r requirements.txt

Finally, you'll have to create a Twitter App; this is a required step otherwise you won't be able to connect to Twitter service. Once you get the the App credentials (API key, API secret, Access Token and Access Token Secret), copy them inside the settings.json file you copied before.

python hashtag-scraper.py [OPTIONS]

Fetched hashtags are dumped inside the wordlist_hashtag.txt file.

Hashtag Scraper has some options for fine tuning:

-l LANG   --lang   LANG     Filter tweets by language (default to 'en')
-e LENGTH --length LENGTH   Minimum length for the hashtag (default to 10)

Feel free to open an issue and, if confirmed, create a Pull Request!