Am I the only one slightly worried about this? I mean, they aren't really impersonating anyone, since the Twitter handle was created before the website was even online.

First come, first served may suck sometimes, but at least it's a clear, well-defined and fair way of allocating handles.

Before registering your personal handle, have you checked if someone had the domain?

I tried to have a twitter handle released recently and no, they don't process individual requests anymore unless you have a trademark or other legal title.

Spotted that, fingers crossed!

Still worth being aware of if your case isn't quite open-and-shut, or you're planning a quick launch. I feel quite an eejit for letting it happen.