Softly launched a month ago, Yahoo Finance's Market Pulse is actually a huge f'in deal. Clearly, the press -- and investors -- hasn't really understood what's going on here. And I'm not talking about StockTwits' inclusion in the real-time stream (there are only two sources of data right now). What's really huge here is the Covestor feed that's showing up on stocks. Market Pulse is a real-time feed -- much like Twitter is -- on specific stocks. So, whenever a trader or investor tweets or writes about a stock, it shows up here. So, everytime someone blabs about $AAPL on StockTwits, investors can follow that stream alongside the other data provided on Yahoo Finance. Is that interesting? Maybe. It is part of the real time conversation and important for hyperactive traders, I guess. But the big deal here is what Covestor is supplying to Yahoo Finance users. As a marketplace for investment services, Covestor actually validates/verifies trading activity of its managers. In turn, Covestor supplies Yahoo's Market Pulse with a real-time stream of trading activity -- real live trades with real money behind them. Users get a feel for how large a portfolio position is (in percentage basis) and whether the investor is building or liquidating a position. Where else can you find this in real time? Nowhere. This is all about the power of the collective tradestream. This takes everything to a whole new level. This is a BIG deal.