CentOS users might have problems with WLAN on their laptops especially with BCM4311 802.11b/g WLAN chipsets. These can be solved by installing proprietary Linux driver by Broadcom.
I've already wrote about virus that spreads via video on Facebook, but it seems not everybody on my friend list noticed it.
Virus spreads via video posted on Facebook! Video named "Mlada ceska pred webkamerou ukazuje vse!" is already blocked by ESET, some info was published by Kaspersky.