f(x)'s Amber was active on Twitter since the 1st day she joined it.

 She shared a new photo on 7th September,she said,"tgif! w/ genneo and dr.justin haha". She had a really great time with her best friends on Friday night.

Fans commented,"Amber,you look so cute","they are lucky to have a friend like you" and etc.

Photo Source: Amber's Twitter