THose are common. Later they can add spam to their signatures.
On my other forum I got an anti spam that blocks these and members under 1 posts cannot edit their profile nor send PMs. I should maybe edit this forum to do the same, but I can't add the anti-spam because it doesn't work on this server (I can't move TIMGUL to my new host because it's too large due to all MP3s)
It's best to report spambot messages, so staff can ban or delete them, in case later they flood the board with junk ads or send viruses to members.