I know this isn't a new thing and it's not really about internet communication. Back in the 80s I went through the following process...
Interviewed for a job, got offered it verbally at interview on the day. Was told they'd be in touch soon.
Heard nothing at all for 6 months and then saw same post advertised again.
Applied again just out of curiosity. Got called at 10PM one evening to be invited for interview next day.
Want to interview and for the second time got told I'd got the job and they would be writing to me.
Left the premises, never heard anything from these people again.
Read all that again and then tell me what you think about it.