Today someone submitted an off-topic link for child car seats to MacMegasite, and a few days ago they submitted the same link to WorldBeatPlanet. Of course that’s completely off-topic for both sites. I removed their link and their user account from both sites.
Why the hell do they think a completely off-topic link like that which has nothing to do with the rest of the site would be accepted?
This is may not be a good practice and most of the people doing this may not be aware of the fact that it may harm their rankings. But yahoo still counts the backlinks without caring about the relevence of linking page. I have seen one site scoring high on yahoo just because of their links posted at user forums.