Warning: This type of behaviour may be illegal. For the US see the FTC guidance: http://www.scribd.com/doc/20635261/FTC-Guides-Concerning-the... (the FTC has bought prosecutions on this topic recently) It's also illegal in the UK and presumably a lot of Europe. You can't make an ad look like an legitimate endorsement, it's as simple as that. In this case the small "sponsored placement" text could easily be taken to b…
What about when some site is raving about a product, and pointing users to the product's website using an affiliate link. No disclosure at all. Is that also illegal? Because I think it would be great if it was.
If you're just providing links without specific endorsement it's probably fine.
Here's an easier read analysis of the FTC guidelines by the Washington Post:
http://www.washingtonpost.com/wp-dyn/content/article/2009/10...