This is kind of interesting. About 7 hours ago, Mara mined a block with a single transaction in it, containing 2 OP_RETURN outputs. They paid a fee of 0.061 BTC ($6,313) to occupy the entire block, about 999 kb of data. Apparently its an advertisement for a new protocol that uses OP_RETURN. The message is somewhat interesting (moreso than the jpeg in the other output) and worth a read, but I won't mention it so as not to help them advertise here.