Hi i have had my uni 2.4 mac book for about a month and i love it but in my finder it says shared and then lists mac and then numbers after it. Is this Someone hacking me? Please tell me what this means Thanks!
That is another computer, or possible a VMWare computer on your own computer. What is being displayed is the MAC address of the ethernet adapter (I think) of the remote computer, that is connecting to the same network as yourself
If you have your own wireless network, that no one should be sharing with you, you could setup the router to only allow computers with their specific MAC address. Consult the manual for doing this. Or make the password for the wireless network longer, mine is like dewsswesp09oi87uz65t (just an approximation).
A Mac address looks like this: 00:24:15:52:2e:fb, and is only used once in the world (correct me if I'm wrong).
If you're only interested in not being able to see the Shared computer, go to Finder > Preferences > Sidebar > Shared and deselect what you don't want to see.