If you start with the second one you won't know what's going on and feel like you've missed a bunch of important story.
This is how it felt after playing the first one as well. Half Life 2 is almost an unrelated game. The plots of the two barely line up.
I thought it was a great idea for official statements. Kind of like a new type of RSS feed.
Local transport companies can advertise delays, meteorology organisations can advertise natural disasters, police can post active missing person alerts, etc.
But it seems like it is just vapid narcissists thinking other people give a shit about their random thoughts.