MySpace and Photobucket are at loggerheads over the former's blocking of the latter's slideshows, reports the New York Times. MySpace began blocking users from adding Photobucket slideshows to their profiles on Tuesday.

The social network says Photobucket slideshows were violating MySpaces terms of service. MySpace specifically pointed to Spider-Man 3-branded slideshow presentations Photobucket recently made available. This is not the first time MySpace has shut off third-party additions. In the past, though, such issues have been blamed on technical problems such as faulty code.

MySpace says it is simply enforcing its terms for third-party widgets and would block only the branded slideshows, not others, if it could. Photobucket says MySpace is infringing on the free speech of its members and stifling the community. The photo site says it was never approached by MySpace to resolve the issue before the plug was pulled.

While there's been speculation that the move could prove disastrous for Photobucket, TechCrunch points out that the site has more or less always been at or near profitability and that most of its income, 68 percent in 2006, comes from on-site advertising, which should not be affected since it's derived from site visits, not widgets that appear elsewhere.