Here we go again. Word on the street is that Myspace (NWS) is joining Google’s (GOOG) Everybody-But-Facebook Coalition. That would mean the anti-Facebook alliance, known as OpenSocial, would grow to 170 million users. (Assuming that Myspace has 70 million active monthly users, as per its July press release.)

Google is holding a press conference later today, presumably to make the announcement. In typical Google fashion, it’s asking journalists not to report the news until after 5 p.m. PST — so, we suppose, to give The New York Times and TechCrunch time to break the details of the story first. That’s what happened Tuesday night, anyway.

Note to Google: Embargoes don’t work anymore.