Facebook Layout Help!!!?

[Tymme]

You have to install an app to change backgrounds, and only people with that app will see the changes. The ability to add/change custom layouts/colors/etc. is a 'hack' that MySpace (and some other sites) allowed that also opens up extra vulnerabilities.

These addons, especially those that you have to 'install' from off-site locations and not within Facebook, are very likely to have ad toolbars, malware, or the like. Facebook apps have to follow certain rules and limit access to what can be modified on a page. Since these "tools" circumvent that, they get money by spamming you with ads or installing virii/etc to get access to your information.