Look guys! I SIGNED A MESSAGE!
(AKA, why do people care about signed messages on a forum?)
Signed message: H/wAvbGanh8nCReRm19cjgEEo+M+L/AWSS+xn61K2U8IVB9qGJcNWAMzkLWAEl0/SznGB8IRG1QGPCNyOElflYQ=
Address: 13MB1aUXyDxEmYQGWztnqo28Qxmw9djzMv
Because it shows you control a particular key (which is harder to steal or hack) than a forum account.