What is Pull A Yahoo!?
To create a lot of hype around something, get large amounts of people "hooked", then close up shop, runaway, then hide behind legal rhetoric all the while still building themselves up to be hip, new, wonderful, fresh...
"Gregory put tons of photos on Yahoo! Photos and a lot of time and energy into "Yahoo! 360. Yahoo shut both down. After moving to other sites, I fear that my new web services might "Pull a Yahoo!" and do the same thing as Yahoo!"
Sentence: "I sure hope Multiply don't pull a Yahoo!"