It specifically mentions cloaking.
> Webspam pages try to get better placement in Google's search results by using various tricks such as hidden text, doorway pages, cloaking, or sneaky redirects. These techniques attempt to compromise the quality of our results and degrade the search experience for everyone.
Facebook doesn't even need Google, their users just visit the site directly.
I guess Mark zuckerberg doesn't lose sleep over this.
- hidden text,
- doorway pages,
- cloaking, or
- sneaky redirects
They just show a big popover nagging you to log-in. But you can click this away.
If certain Facebook content pages rank low, or do not rank at all, it is because Facebook actively blocks Googlebot from accessing the content, not because Facebook is trying to deceive Google (or the user).
Though Facebook does not need Google, it could get quite a lot more visitors if it lowered the wall of its garden a bit. As is, Facebook is an inaccessible social echo chamber, and I don't lose any sleep over this.