What is this effect?

First of all, I'm Italian, so excuse me for my bad English

I've seen many videos on YouTube that make this effect, I list two:

1. From 2:12 to 2:25 - http://www.youtube.com/watch?v=zDgBUwhUAVE

2. In almost all the scenes - http://www.youtube.com/watch?v=MokNvbiRqCM

In the first video there are lines (such as privacy)

In the second video there is a grid effect (pixel stuff) that looks very good

what effects are they?

Thanks a lot!