One of the hottest Internet videos during the mortgage and banking crisis has been a YouTube clip titled "Burning Down the House," which outlines the untold story of how liberal Democrats pressured banks and lenders to throw standards out the window and give money to people who couldn't pay it back.

Try watching it now, however, and you won't be able to, thanks to the growing problem of "flag spam," the practice of abusing online filter systems to squelch political speech with which one disagrees.

We've all seen spammers at work in our e-mail inboxes. Experts estimate that 90 percent of all e-mail messages nowadays are spam, or unsolicited commercial e-mail.

Luckily for most of us, the majority of it gets filtered out. That's caused the more sophisticated spammers to change course and target a more vulnerable part of the Internet - the hugely popular Web sites like YouTube, Digg and the blogosphere, where anyone can join the discussion by posting videos, essays, reviews and other content.

When interviewed by Eyeblast.tv last month, Google CEO Eric Schmidt said that YouTube, the video-sharing site owned by his company, is "pretty serious" about removing the "strange" videos that keep popping up on the site, especially videos "that can be used to incite bad outcomes." Apparently videos designed to incite Catholics don't fall into that category.

A YouTube user who goes by the moniker "fsmdude" has posted more than 30 videos under the title "Eucharist Desecration." Each video features an attack on a symbol that Catholics consider sacred -- by blow gun, nail gun, boiling, sword and cigarette in a few recent episodes.

The creator of the videos isn't subtle about his intent. He was angered by reports of a college student allegedly receiving e-mail threats from "fanatical Catholics" after the student snatched a wafer at mass, so "fsmdude" decided to repeatedly profane the Eucharist on camera for all to see.