Received one of those messages from the same sender as well, to an address of mine which I published only on Facebook to "my friends".
Each of the included links is unique as you probably noticed. So I guess this is actually a big orchestrated effort to somehow link BM addresses to IP numbers. Very odd.
I wonder where they get the addresses from, and if there is some malicious script on the linked site.
... just as I type, one of those messages arrived on another address of mine which I only shared via email to very few people...
ODD!!!
Yea, I did notice that as well, which is one of the reasons that thought about linking BM to IP occurred to me. I am pretty sure I only used the one I'd shared before to follow the link, but my IP is protected by a VPN anyway so they'd have nothing.
Are you saying that these messages are sent to addresses that were never made public?
Yes, I am saying that. But I'm not sure that your implications are correct. Like reading the blockchain, they may be able to find the public keys of every address on the network without trouble.