On Saturday, an abusive post against me was posted under Kayleigh's name, and subsequently deleted by Tech. This caused both me and Kayleigh some distress. Mumsnet found that, at the same time, some attempted log-ins under other MNer's names were made on my computer. I have since found that my sister's boyfriend's 7 year old had found a sheet of paper on which I had scribbled down the MN chat names and real names of a couple of MNers who had catted me, and had used those to access MN (which I had left logged on) and post the message.
I am horribly embarrassed by this and want to apologise on his behalf. I am also really cross with myself for having left the computer unattended whilst logged on, particularly with having left names and nicknames lying around.
I just wanted to clear this up, and to remind everyone of the need for security - even when, as I did, you think you are safe! And I really hope that everyone is still speaking to me after this! It might also serve as a reminder to people to change their passwords.