As all known, google panda 3.3 run out, in the announcement of google: one old method to evaluate links used for some years was turned off by google. so this is very important for every webmaster. what method do you think was turned off? i think it`s anchor text. because google always focus on Human behavior to improve their rank result. and real human or customers usually dont use the "Accurate keywords" as anchor text, but webmasters do "Accurate keywords" to improve website rank. so google should find this case, they will removal the Anthropogenic impact，keep all rank natural. but people will talk the "radom anchor text" in related topics such as forum or blogs, so the "related" is the most important. what do you think of it?
so i think some backlinks ways such as profile and signature in non-related will not any good improvement for your rank, even bad effect.
I'm so glad I don't build links with blog networks anymore They used to work so well a couple of years ago, but now they are hated by most search engines.