With Facebook's IPO in the books, industry players are weighing in on what the events of last week meant. Not surprisingly, some are still putting into context the potential ramifications of General Motors significantly cutting back on Facebook ads.

Addressing the GM situation, Gerald Hensel, Strategy Lead at Blast Radius, a WPP-owned digital agency, told ClickZ, "Currently most companies do not use Facebook targeting effectively and creatively enough. If you want to build a community on Facebook, there is no way around Facebook media buys."