Girls' Generation's Tiffany welcomed and congratulated member Yoona on opening a Instagram account during the Chuseok, or Korean Thanksgiving holiday.

Posting a collage photo on Sunday, September 28th of the herself and Yoona, the two are making a variety of poses and looks.

"Welcome to the wonderful world of social media bae," posted Tiffany on her Instagram on Sunday along with a picture.

Yoona opened up her Instagram account (@yoona_lim) on this day.