The daily OBV (not shown) shows a positive volume spike last week so the OBV is still above its recent lows.

FORBES: Don't Jump Off the Fiscal Cliff

It turns out that the noise on big-time Facebook walls almost entirely drowns out trends like those, but posting volume does spike when wall owners make it into the news.

FORBES: What's on Justin Bieber's Facebook Wall? [Graph] [Taking Requests]

The daily OBV is still acting weaker than prices despite the spike in upside volume on October 19th.

FORBES: Thumbs Up For 2 Defense Stocks