Helmet I'd dearly love to PM you and ask for a clue as to who your agent might be, but I know that would be putting you on the spot and compromising your MN anonymity and I wouldn't do that.
I'm in the UK publishing industry and stalk twitter, saying nothing, liking nothing, but risking the odd GC follow. If anyone scrutinised my account they'd see I follow Jane Clare Jones, Fair Cop, Allison Bailey etc and know what my position is, but I have American publishers too and I can't risk doing more. (I've even name changed for this post, so dots can't be joined - I have a long MN posting history on lots of different subjects though now I'm 99% FWR.) Occasionally I see other authors I follow liking tweets by those accounts, so I have an idea of which of my friends are GC, but never any industry people. I was gutted by the amount of support shown to Damian Barr, and the number of people in my professional circle denouncing JKR, which just hammered home how dangerous it would be for me to give any hint of my views.
An out GC agent is a rare and marvellous thing.