2 Clarifications.
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There is no legal requirement. However, it might be considered good ediquette if you do indicate Advertisement or Sponsored by to let your users know that this is leading to an external site and is not part of your site's content.

Depending on how you present the ads in relationship to your content, some users may view non-disclosures as false advertising, and get turned-off to using ityour site (i.e., bounce). 

Additionally, since you may not be able to control which ads are displayed, this will likely result in some discontinuity between your site's content and these ads.

Also depending on yourthe code used, a disclosure might help explain why the content is blocked by ad filters and blocking programs, which would otherwise not be understood.

All of these factors might actually hamper your site's performance/effectiveness, so it's likely wisewiser to add a disclosure, regardless of legalities.

There is no legal requirement. However, it might be considered good ediquette if you do indicate Advertisement or Sponsored by to let your users know that this is leading to an external site and is not part of your site's content.

Depending on how present the ads in relationship to your content, some users may view non-disclosures as false advertising, and get turned-off to using it (i.e., bounce). Additionally, since you may not be able to control which ads are displayed, this will likely result in discontinuity between your site's content and these ads.

Also depending on your code, a disclosure might help explain why the content is blocked by ad filters and blocking programs, which would otherwise not be understood.

All of these factors might actually hamper your site's performance/effectiveness, so it's likely wise to add a disclosure.

There is no legal requirement. However, it might be considered good ediquette if you do indicate Advertisement or Sponsored by to let your users know that this is leading to an external site and is not part of your site's content.

Depending on how you present the ads in relationship to your content, some users may view non-disclosures as false advertising, and get turned-off to using your site (i.e., bounce). 

Additionally, since you may not be able to control which ads are displayed, this will likely result in some discontinuity between your site's content and these ads.

Also depending on the code used, a disclosure might help explain why the content is blocked by ad filters and blocking programs, which would otherwise not be understood.

All of these factors might actually hamper your site's performance/effectiveness, so it's likely wiser to add a disclosure, regardless of legalities.

1
source | link

There is no legal requirement. However, it might be considered good ediquette if you do indicate Advertisement or Sponsored by to let your users know that this is leading to an external site and is not part of your site's content.

Depending on how present the ads in relationship to your content, some users may view non-disclosures as false advertising, and get turned-off to using it (i.e., bounce). Additionally, since you may not be able to control which ads are displayed, this will likely result in discontinuity between your site's content and these ads.

Also depending on your code, a disclosure might help explain why the content is blocked by ad filters and blocking programs, which would otherwise not be understood.

All of these factors might actually hamper your site's performance/effectiveness, so it's likely wise to add a disclosure.