Hey ​@Mohammad Nader Alqhf here’s the documentation for this:

https://help.manychat.com/hc/en-us/articles/14281316989724-Instagram-Post-and-Reel-Comments-Trigger

Dear Mr. Gustavo,

Thanks for your reply , I will check .

Hi Mr. ​@Gustavo Boregio again ,

This is only for Instagram , is there anything similar for FaceBook ?

Regards 

​@Mohammad Nader Alqhf yes you can set the same process for facebook comments, if you could not get it, lets contact me for help.

Dear Mr.@Aafia Umair,

Thanks for your reply 

It worked finally but I would like to contact you to see if we can use your experience somehow in my company. If you can leave your contact details then I would be thankful.

Regards