One of the first social networking upstarts, MySpace, is facing continuing security problems that threaten to spoil many of the innovative features that make the site useful.

Hackers, spammers and Internet malcontents have turned many of the “group” sites, which are dedicated to interests such as home beer brewing, animal welfare and gay rights issues, into cyber-graffiti walls, filled with offensive comments and photographs.

Those trashing the group profiles are known as trolls, who delight in making a mess and try to one-up each another with aggressive vandalism. They post taunting videos on YouTube.com, egging each other on and making real-world threats.

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