Sure Sign of Something

I've started getting a lot of spam messages referencing Facebook. 

Like, "Melinda sent you a message on Facebook." 

They may have been around before, but I don't recall getting them before this week. Has Facebook finally reached a critical mass of users, such that it's efficient to try to lure people to open messages pretending to come from it?

Sure, I personally think "Who the heck is Melinda? Also, why is this in my Junk folder, and why does the return address contain a weird(er than usual) string of letters and numbers?" but someone with a less effective spam filter, or who knows a Melinda, might well go ahead and open the message. 

And then purchase the pharmaceutical knockoffs or incur the virus infection or whatever the message is about. So very clever, these spammers.

I guess that's a sign of cultural relevance for Facebook. Or something.