Facebook is exploring the blockchain technology. They will get into it and might bring their own crypto once SEC in the US comes out with some new change in crypto policy. Until then every company, including twitter will only wait and watch unless there is something interesting and safe for them to do.
Facebook has a lot of investors who invest in the study of the crypto currency, so they will achieve some result. What to say about Twitter, this takes time, because some still distrust the crypt or do not see the utility in it.