Arrow no connects Facebook, Messenger and Youtube. MIUI 4.2.2


My problem looks like this.
I can not connect to the chat, facebook and messanger and I can not watch youtube videos.
I have a software MIUI phone Desire S
4.2.2 JDQ39E v5 android JB
MIUI 3.12.27

I do not know what is wrong. All applications are updated up to date.

I worked it out. Please delete the file system / etc / hosts.txt and the problem: P