It's text only. No reply and no adds. This was the last message I received from the Twitter feed.
@CALFIRESANDIEGO: CAL FIRE Otay IC reports the fire at the Otay Border 1/2 acre, forward ROS stopped. Units being released. (about 22 hours ago)
The main advantage is that it gives you a low bandwidth link to the emergency services announcements. It's second only to radio in reliability, but doesn't require constant monitoring.
Most of the time, I only have the local Emergency Management Agency feed turned on (readysandiego). Because there's currently a red flag fire warning in effect, I also have the CalFire feed turned on as well.