the future of libraries in the digital age
For presenting, is it okay to reuse a presentation that I've already given previously.
I like to think I have pretty good one about what I do with UKlibchat, and I think it fits in vary well with the strand on continuing professional development.
Because of the international audience for the Library 2.012 conference, it is likely that most of those who would attend your virtual session will not have heard your previous presentation. I would encourage you to submit your full proposal and let the conference committee review it on its merits.