Can the Sony DSC-WX220 be used as a vlogging camera?
Yes, a lot of people buy it specifically for vlogging.
Can the Sony DSC-WX220 stream to an external display?
Yes, it can connect wirelessly to a device and stream video to it via Wi-FI. Its mini-HDMI port can also connect to an external display via an appropriate HDMI cable (not included).
Check out a video by Allessandro Pascucci below demonstrating wireless streaming from the Sony DSC-WX220 connected to an iPad Air 2:
Videos on YouTube: Sony DSC-WX220