Outbrain

Overview

Outbrain is a content recommendation and native advertising network founded in 2006 and headquartered in New York. It serves sponsored content recommendations — typically appearing as "You May Also Like," "Around the Web," or "Recommended Stories" widgets at the bottom of publisher articles — across thousands of premium publisher sites including CNN, Le Monde, Sky News, and La Repubblica. Outbrain connects advertisers (who pay to distribute their content) with publishers (who monetize page real estate). In 2019, Outbrain merged with Taboola in a deal later abandoned; it remains an independent company. The Outbrain script delivers paid content recommendations, tracks engagement, fires conversion pixels on advertiser sites, and builds cross-site behavioral profiles for recommendation personalization.

What This Script Does

Script Files and Domains

The Outbrain publisher widget loads from widgets.outbrain.com/outbrain.js. Additional scripts load from cdn.outbrain.com and log.outbrain.com. Conversion pixels on advertiser sites fire to tr.outbrain.com/unifiedPixel. Behavioral telemetry goes to log.outbrain.com/loggerServices/v1. RTB bid requests originate from odb.outbrain.com.

Cookies Set

• obuid — Outbrain's primary cross-site visitor identifier. Persistent, 6-month expiry. Third-party cookie set on outbrain.com. The core identifier used to link browsing sessions across all Outbrain publisher sites for behavioral targeting and recommendation personalization.
• outbrain_cid_fetch — Caching cookie for cross-domain ID resolution. Persistent, 1 day.
• ob-user-token — Outbrain's authenticated user token for logged-in consent and preference states.
• _ob_1p — First-party fallback identifier cookie. When third-party cookies are blocked, Outbrain uses a server-side redirect technique to set a first-party cookie on the publisher's domain that mirrors the obuid. This technique has been specifically called out in GDPR enforcement discussions as a consent bypass mechanism.

Recommendation Widget

The Outbrain widget queries odb.outbrain.com with: the current page URL, the obuid cookie value, geographic location, device type, and a publisher placement ID. The API returns a JSON feed of recommended articles (mix of editorial and paid). Paid recommendations are labeled "Promoted" or "Sponsored." Click-through tracking wraps every link with an Outbrain redirect URL (ob.absensing.com or paid.outbrain.com/network/redir) to log the click event for advertiser billing.

Conversion Pixel (Advertiser Side)

On advertiser sites, the Outbrain conversion pixel (tr.outbrain.com/unifiedPixel) fires standard events: PAGE_VIEW, PURCHASE (with revenue and order ID), LEAD, DOWNLOAD, SIGN_UP, ADD_TO_CART. Conversion data is matched against Outbrain's click-log to attribute conversions to specific recommendation clicks, enabling ROAS reporting in Outbrain's Amplify dashboard.

Behavioral Profile Building

Outbrain maintains content interest profiles keyed to the obuid cookie. Each page view on an Outbrain-equipped publisher site updates the user's interest vector with the page's IAB content category, detected topic clusters, and scroll engagement depth. This profile drives the "personalized" aspect of recommendations — surfacing content likely to generate clicks from this specific user. These profiles are also used to qualify the user for audience segments sold to Outbrain advertisers.

Consent & Compliance

Category: Marketing

Outbrain is a registered IAB TCF 2.2 vendor (Vendor ID 164). TCF purposes exercised: Purpose 1 (Store/access information), Purpose 2 (Select basic ads), Purpose 3 (Create personalised ads profile), Purpose 4 (Select personalised ads), Purpose 5 (Create personalised content profile), Purpose 6 (Select personalised content), Purpose 7 (Measure ad performance), Purpose 9 (Apply market research), Purpose 10 (Develop and improve products).

The CNIL has specifically cited Outbrain as an example of a "content recommendation widget" that requires consent under GDPR and ePrivacy because it sets tracking cookies and builds behavioral profiles. Outbrain's first-party cookie fallback mechanism (_ob_1p) has also attracted scrutiny as a potential circumvention of browser privacy restrictions.

Under CCPA, Outbrain's behavioral data sharing for advertising qualifies as "sharing" personal information.

Outbrain is registered under the EU-US Data Privacy Framework.

Should You Block This Without Consent?

Yes. Outbrain is a paid content distribution and behavioral advertising network. It sets persistent tracking cookies (including first-party fallbacks), builds cross-site interest profiles, fires conversion pixels on advertiser sites, and serves targeted paid recommendations. Block until marketing consent is obtained.