Amanda Fung of Crain's New York notes that Manhattan-based video blog companies like Rocketboom and blip.tv are starting to experiment with subscription fees and paid advertisements, "marking a big step in extending Internet-posting software to a wider audience." Until now, both companies have provided free services and relied on word-of-mouth advertising, but have generated little or no cash flow. By charging subscription fees and experimenting with paid advertising, though, the companies may alienate some vbloggers. According to Rocketboom's Amanda Congdon, "Ads are trickier because visitors don't want to see a bunch of text links on the Rocketboom Web site. Our audience is sensitive to text ads so we are going to be careful."