As noted yesterday, Sin Cara underwent surgery yesterday, his brother Argos confirmed on Facebook. He underwent knee surgery in Houston on Tuesday after the original surgery was scheduled for Monday. Argos notes that the surgery went well.
Regarding the recent Twitter craze on WWE television, PWInsider.com notes that top-level employees know that they are overdoing the mentions of the social media website, but the feeling is that it needs to be done in order to build ratings for the dwindling RAW and SmackDown! products, especially the former.