I was on Twitter today and noticed Eloqua has this awesome capability to add forms to Twitter. Very user friendly! It would be awesome to get this functionality.
This is done using Twitter cards, and Marketo is completely compatible with those. For the instructions on setting it up you can go here: https://support.twitter.com/articles/20171768-lead-campaigns-faq-best-practices and then scroll down and click the 'Marketo' Link.
Even better, as Marketo has mobile optimized landing pages, you can easily create mobile landing pages for your web cards and custom destination pages. Since Twitter users are 80% mobile, this is going to be a key benefit for you and them!