Countless articles about links are written every day. Many of them are excellent, filled with some really good tips to help you do well. Some of them are awful, full of bad advice. However, the biggest thing that bugs me about link-building advice is this: a lot of it pretends to offer guarantees.
People talk about how to Penguin-proof sites, how to avoid being manually penalized and so on. As an extremely paranoid link builder who has seen many examples of unfairness online, I don’t believe there are any guarantees, and below you’ll see why that is.
1. No link is risk-free
How many types of links have previously been acceptable, only to eventually be written into Google’s guidelines as being a link scheme or some other violation?
For example, theoretically, a nofollowed link should be risk-free. Would I bet on it? Nope. And honestly, who has a profile full of only nofollowed links? That would look very strange, no? What’s going to happen when Google finds a way to do something different with nofollow? What if they decide it’s not enough, and they introduce something else?
via Marketing Land