Some IM services, like ICQ, do not have intuitive names. Also, many people use obscure handles in Instant Messenger. This makes it difficult to know whether an Authorization Request is valid or not.

I will attach graphic of an ICQ request for an example.

ICQ has a simple URL for checking profiles online:
http://www.icq.com/whitepages/about_me.php?uin=152202004

It turns out that the request in this case was from some guy in Japan seeking hot gay chat with me. Since I already have a relationship with a lonely septagenarian man in Nagasaki, I declined. But the point is that I had to manually search ICQ, which makes it difficult to assert the identity of the requestor.)

So, ideally, there would be a "Who is this?" button that brokers the link for the user. (And if the button were backed by a simple configuration file that could be adapted when the URL's change, that would be a great way to fix the issue.)

Finally, I realize that we have far more important issues before release, so please take this as a suggestion/request for the future.