Tested and confirmed. I'll let the programmers know.

We have been told that this is set up like you being able to like your own posts on Facebook. I don't think this is going to be changed.

I will ask if this can be limited to one like :)

I will see!

Doesn't look like they are considering making any changes with this, but you're always welcome to make a thread in the Suggestions & Ideas forum. :)

Since there's no bug, I am going to lock this up.