I don't know that you can rule out a properly written directory or forum sig as these will generally have page text relating to the user's interests. A general interest forum or directory will probably have lots of different key words in the text so provide little value to the links though, however if you post regularly in a specific subject then you may get a bit more weighting to your sig links. Dumping the same text into loads of directories is likely to get weighted low on duplication.
I think it's up to the spider to find the links and the engine's algorythms to determine the value of each link. Obviously anything designed to give a spider a different view of the site is where the grey / black areas come in. |