Are there keywords that you should not ever use? I hope that doesn't sound ignorant. I mean say when you are adding content to your site and you add the keywords are there any that you really shouldn't add? I'm thinking all would be safe but about the time I go in to do this then I will make that mistake.

"buy/sell/trade child pornography"

That might look bad.

I think that'll probably bring the FBI knocking on your door.

Hahaha, that certainly will. There are cases where you are not allowed to use certain keywords in your domain name, which are protected branded keywords. For example, I think anything related to Olympic Games would be a very big problem.

I read a few years back that there were some attempts to forbid anyone from using those two words without permission, but somehow I don't think that ended very well in their case. Imagine authority on such an important keyword phrase, just in hands of one entity...

Anyone call for a raid?

Yea I could think of a few off the top of my head but I am not sure if there is a specific "list" out there of the no no's, if there is I am sure anyone that went looking (even with good intentions) would end up being flagged in some sort of way.

I hope you should not use the keywords related to the business services that you dont offer, this might be harmful to you

There might be such keywords but how it's going to benefit you if you've thought to optimize them?

Many times you have a blog post on some new services and traffic comes on to your blog and they go onto the main site checking the services they are looking for, it gives a negative impact on the user if we dont offer the service he is looking for

You will never use them but your competitors can use them and you will never know about that. That is the factors which do not depend on you

I think you should use keyword phrases that people really search for..

You don't want to use any keyword that will make any kind of " false statement".

For example, you don't want to use "unlimited xxx" while it is not actually "unlimited". etc...

Thats a good point. I hate companies offering unlimited xxx bandwidth/disk space because it's not possible and it gives the whole web hosting industry a bad image.

abusive, provocative keywords should be ignored, this might result in bad reputation of your company

As long as the services you sell are -

a) Legitimate.
b) Non-abusive.
c) Your keywords are relevant content to what your site is offering.

Then you should have no problems whatsoever.

I think so as well. I also think that anyone using those type or combination of keywords has way too much of the in them and needs some help and guidance in life. Thanks guys you all have been pretty helpful!