Can you please shorten my topic sentence to 20 sentemces long:

While some claim that Instagram lowers teenagers' self-esteem, in reality, it fosters positivity and creativity. Platform improvements encourage a positive atmosphere and reward creative work.

Instagram fosters positive environments and stimulates creativity despite claims of negative impacts on teenagers' self-esteem. The platform's continuous improvements promote a positive atmosphere towards users and provide incentives for creative efforts.

the word limit is 20

Instagram fosters creativity and positivity despite claims of negative impacts on teens' self-esteem.

Certainly! Here's a shortened version of your topic sentence:

Instagram encourages positivity and creativity among teenagers through platform improvements that create a positive atmosphere and recognize creative work.