At RubyConf 2019, I learned that social media hashtags are more easily read by screen readers if they are capitalized. So #rubyconf is more accessible when written as #RubyConf, because the screen reader can more easily make sense of the word breaks. Keep this in mind when posting and designing marketing campaigns.
I saw #rubyfriends and #rubyconf migrate to #RubyFriends and #RubyConf at the conference in realtime as this idea spread.
h/t Coraline Ada Ehmke