[iso1337]

Instagram is one of the few platforms that allows you to comment on ads. It's pretty interesting as the comments tend to be overwhelmingly negative.

[avrionov]

Reddit also allows or used to allow commenting on the some ads.

[beeboop]

Outrage drives engagement, it's making people engaged with ads. I'm sure there's a positive effect there to conversation rates.

[nyadesu]

Facebook/Meta also allows it I think, but comment section on ad publications is heavily moderated

[mongol]

Twitter also

[Retr0id]

Although, now it is also possible to disable replies on a tweet (sponsored or otherwise)

[koverda]

I noticed the opposite, there's a lot of people leaving positive comments on a lot of ads.

[agluszak]

Facebook also allows that