[Saske20]

Guys i saw some few youtube videos, mostly funny ones when they talk in facebook. Like they login and start talking and doing stuff. It look smooth and they created from 0 or there is a app ?

[Lucio]

If you could post a link of the video it'd be real easy for any of us to let you know.

[XanPa]

Done in after effects. just texts and layers animated to fit facebook's style.
I'm not aware of any app that does that.

[Kidjohnz™]

If you can post a video on this, it'd give us a better idea on what you're talking about.

[Fortunate]

It's just after effects/sony vegas video-editing. Most of the advanced video-editing softwares will have tools in order to create animations and stuff that you mentioned.