With a new LA office and a forthcoming creator studio, TikTok is poised to take on Instagram and YouTube (GOOG, FB)

· Short-form video app TikTok just announced it would open a studio for creators.
· TikTok, which is owned by the China-based company ByteDance, also recently opened an office in Los Angeles and i for a US CEO.
· Building up US operations may be a sign that TikTok might be looking to take on social media giants Instagram and...