This is the message I sent to Denotes users, posting here as well.
Heya folks. I am shutting denot.es off in a month or so.
identi.ca switched to pump.io software, and has mostly punched a huge hole in the StatusNet community, and I don’t think it will recover. Meh.
I could deal with that, since I love running me some software, but I just received notice from another site admin with a security patch. The driving force behind StatusNet was Evan, and since all his energy is behind pump.io now, we don’t have a centralized way to push out security patches (since I sent this email out Evan patched the code, so I was just confused by getting a message from the person that created the patch). That is too much of an expense to run software that I am not going to actively use.
It was a good run. I will help anyone get their content exported, if they want.
I am not giving up on a federated social network, but I am changing how I think it should be done. In the coming months I will lay out how I think WordPress could be the platform that folks could use for their public social network needs. Fortunately I don’t have time to just lay it out, because work is plentiful! 
Feel free to ping me if you have any questions.