Did someone also get bunch of this messages?

I found that in these messages only those letters: i, o, t, d, e, s, u.
Dose it mean something? Is it a code or just encrypted word? If someone knows anything ab that tell me

Internet Of Things, desu

yes, the encrypted word is "OUTSIDE"

and if you looked outside during that event, you would have seen a good friend of yours ;3

Scripted story event. You should grab a camera and take a picture.