Facebook told Inside Facebook that its natural language processing doesn’t detect sentiment, how a Page’s name is being used, or whether the mentioned Page was actually the focus of the update. Page owners may not like Facebook linking to their Page if a post isn’t actually what a user was discussing or if it is being talked about negatively.
That makes it a keyword search. Natural Language Processing implies that it intelligently parses the text to locate the topic, this is Dumb Processing.
Things we are working on next for our Alpha in October:
from http://www.joindiaspora.com/2010/09/15/developer-release.html
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Top Ten Things Overheard At The ANSI C Draft Committee Meetings: (7) Well, it's an excellent idea, but it would make the compilers too hard to write.