Someone randomly messaged me... is this spam?

Right after making a yahoo mail account I saw that I had a message from some random person saying hi. When I said ummm who is this? It said they were offline. I don't know the person, and it's kind of strange... the account is brand new. Is my yahoo mail hacked, or is this just spam? Is this something to... show more Right after making a yahoo mail account I saw that I had a message from some random person saying hi. When I said ummm who is this? It said they were offline. I don't know the person, and it's kind of strange... the account is brand new. Is my yahoo mail hacked, or is this just spam?

Is this something to worry about, or does it happen all the time? Do I just report the person as spam and block them? Thanks.
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