WRT affiliate programs, I've never had a problem with an book review that has an affiliate link to buy the book. If you're a plumber, and you found this great robot camera for inspecting pipes, sell it.
I think the main thing, if you're in it for the long run, is to preserve authenticity. It's easy to start seeming spammy.
I think the main thing, if you're in it for the long run, is to preserve authenticity. It's easy to start seeming spammy.