Earlier speculation that GREATER MEDIA Talk WTKK/BOSTON is considering a format change sooner rather than later (NET NEWS, 12/11) may be getting closer to reality with the news that station veteran and current afternoon host MICHAEL GRAHAM has left the building. His departure follows that of middayer DOUG MEEHAN (NET NEWS, 12/17). The fate of other staffers is still unconfirmed; the station is currently airing "best ofs" of morning duo JIM AND MARGERY. We'll have more details on anything else as soon as we can confirm them. In the meantime, GRAHAM is actively looking for his next opportunity.