Google Penguin 2.1

[PK357]

Yes, you have to be very careful how you build links now. Optimized keywords in anchor text with a dofollow link is no longer the smart way to go. If you do this on a mass scale you will be deindexed without warning. I'm already seeing it. Use only branded anchor text, and vary with or without .com (.net.biz. or whatever) to give you anchor text variation. Also, start building nofollows too, or else you are putting yourself in a bad position...