I got accepted to the CS PhD at RPI and I already accepted the offer. I don't know about a Facebook group or anything like that. It'd be nice to meet some others that are planning on going. I already met a few other prospective grad students at their visit day last week.
Maybe contact your department for more information? I just got information today about visit days for computer science at RPI, and they're offering some reimbursement. The first e-mail just said what days they are doing the visit days on, but I responded saying which date I wanted to attend and then they sent me information about how much they'll pay for and how the reimbursement will work.