I voted two, since I use Phelan for KGS and OGS. I used to have an account on IGS, but don't know if it's still there. Also created accounts for Batoo and WBaduk, but have barely used them. All of them Phelan, so I consider them one account.

My other account is on KGS, and is for moody days. Basically I play what Araban called "donk openings", and games usually devolve into all-or-nothing fights.

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a1h1 [1d]: You just need to curse the gods and defend.
Good Go = Shape.
Associação Portuguesa de Go

I have one account on IGS,KGS,Oro,Tygem. I have had an IGS account in the past which is at 9k and I'm too lazy to play and increase the rank. I have an account on KGS solely to play teaching games with weaker players.

Two accounts. One KGS, one DGS. Played only a handful of games on DGS. Mostly stick to KGS, and I don't care if I experiment with my main account. Rank graph goes up and down, but I don't mind. Looks like a mountain range.

I have two accounts, well actually three if you count yahoo! games. I use the two on KGS somewhat regualarly when I have the time to play. The yahoo acount...not so much.

I currently have two: "wms" (my playing account) and "Admin" (which I use when I need to shut the server down, and really not much any other time). Both on KGS.

In the past, I had "wms" accounts on IGS and NNGS, but the IGS one expired over 10 years ago, and NNGS itself is gone as far as I can tell.

So total, over time, is only 4 online accounts.

This doesn't count all the accounts I set up to test KGS as I developed it; I'm sure there are over 100 of those, but I doubt that these are what is meant by the poll.