As Facebook (FB) begins its IPO road show on Monday, expect questions about its slowing ad sales...

|About: Facebook (FB)|By:, SA News Editor

As Facebook (FB) begins its IPO road show on Monday, expect questions about its slowing ad sales growth and evolving ad monetization efforts to take center stage. Some top brands and ad agencies are voicing concerns about the effectiveness of Facebook ads and/or their ability to measure results. Other advertisers complain Facebook isn't willing to engage with them, though they're willing to spend big.