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My key 4175DCF03F9A241A is on there as well as on the keyserver I linked to. It's also on my site. Not had anyone use it in ages.

I had to set my PC up again recently, so just looking at getting Enigmail working again. I am not really surprised few people encrypt email as it's generally not easy to set up. I did a few keysignings back in the day, but it was all dedicated geeks.

I think you need to activate the key somewhere so people can message you conveniently from keybase UI.

Not sure what was going on. My key did not expire until next year, but I extended that and updated it. Seems to work now. I do not give them my private keys even though they say they are secure depended on pass-phrase. Just does not feel right.