Comment by Daviey

I bet you see this response, which demonstrates that it is a sort of engagement platform.

Same as in you profile you can view your own comments (and others) , scanning the message for an @ symbol and checking for a valid username I wouldn't consider to be a major undertaking.

As I said in my comment, searching for @username vs username is much easier already.

But yes, a third party could do it. Perhaps @dangrossman (yes, I did that) may be interested.