Google’s "Discussions and Forums" SERP Feature: A Deep Dive into Dominant Platforms and Emerging Trends

A comprehensive analysis of 145 million US Google search results has revealed the significant presence and evolving landscape of the "Discussions and forums" Search Engine Results Page (SERP) feature. This feature, appearing in 11.7% of analyzed searches, or 16.93 million results, highlights the increasing prominence of user-generated content and community discussions in search queries. Leading the charge is Reddit.com, a ubiquitous presence in 87.8% of these feature instances in the US and 83.9% globally, averaging 1.29 link appearances per SERP.

The study, conducted in collaboration with Ahrefs’ data scientist Xibeijia Guan, delved into the prominence of various domains, the emergence of newer forums, and the potential impact of backlinks on these search results.

Reddit’s Enduring Dominance and Evolving Reach

Reddit consistently demonstrates remarkable prevalence, appearing in 83.9% of "Discussions and forums" SERP feature instances, a figure that has shown a slight increase to 86.1% in early August data. Its dominance extends across 34 countries, where it is the most prominent domain, and holds strong positions in others, such as India and South Africa, where it ranks second. In these latter cases, Quora and Facebook respectively emerge as more prominent platforms.

An examination of the top 100 most prevalent subreddits revealed that established communities remain dominant. The average age of these top subreddits is an impressive 16 years and 1 month. The youngest identified subreddit was r/ScienceBasedParenting, established 8 years ago. Community size and activity also vary, with /r/backpain having 81,027 members and /r/wichita, a subreddit for residents of Wichita, Kansas, reporting 42,000 weekly visitors at the time of analysis. The research found no surprising new or inactive communities breaking into the top 100 most prominent across all of Reddit, indicating that established, active communities continue to capture search visibility. Ahrefs Keywords Explorer can be utilized to identify prominent communities and subreddits relevant to specific industries.

The Concentrated Power of Top Domains

The "Discussions and forums" SERP feature often includes multiple links from a single site. Globally, just three domains account for a substantial 76.75% of all link appearances within this feature. The top 10 domains collectively represent 84.87% of all links, while the top 100 domains contribute 91.51%. Domains ranked between 501 and 1,000 add a mere 1.49% to overall visibility, and the top 1,000 domains collectively account for 96.81% of mentions.

Facebook’s Ascent Fueled by Groups

Facebook has become the second most prevalent site within the "Discussions and forums" SERP feature, largely due to the visibility of public Facebook Groups. In the US, Facebook appears in 38.3% of all instances of this SERP feature, a statistic consistent across all countries. Public Facebook Groups, launched in October 2010, are the source of all Facebook URLs appearing in search results. Interestingly, Google appears to be incorporating AI-generated page headlines directly from Facebook. The top 10 Facebook posts appeared for a combined 4,936 queries, with the top 10 Groups accounting for 2.82% of Facebook’s link placements within this feature. Facebook’s prominence in search results surpassed Quora in January of the current year. While official figures are not disclosed by Facebook, estimates suggest between 10 million and 70 million active groups on the platform. Facebook is the most prominent domain in South Africa, Zimbabwe, Zambia, and Samoa, and the second most prominent in 23 countries, including the USA, UK, Canada, and Australia.

Quora: A Consistent Contributor to Search Discussions

Quora ranks as the third most prominent site, consistently appearing in search results across countries like the USA, UK, and Canada. With 8.22 million search result appearances, Quora addresses a wide spectrum of queries, from cosmetic surgery costs to email unsend functions. Its top-ranking threads often revolve around where to watch movies online. Notably, Quora’s AI Assistant, launched in early 2023, is frequently featured in top answers. The platform, like others, faces the challenge of user-generated content, with some interactions being genuine and others self-promotional.

Top Domains in "Discussions and Forums" SERP Feature

The top 25 domains by presence in "Discussions and forums" SERP feature instances are:

Ahrefs Site Explorer allows users to identify domains ranking for this feature by filtering organic keywords for "Discussions and forums" and selecting "Include target in."

Domain Age and Emerging Forums

The average age of the top 1,000 domains appearing in the "Discussions and forums" SERP feature is 21 years and 8 months. While most domains are well-established, a few newer sites have emerged. XDAforums.com, technically the most recently registered at under three years old, is a product of a redirect from forums.xda-developers.com. The Gear Forum, a guitar community, is under four years old and does not appear to be a redirect, ranking 748th globally and appearing for 1,200 search results. It is important to note that these ages do not account for forums built on domains at a later date or redirected from other sources. The study suggests that launching a new forum should be driven by genuine interest and perceived opportunity, rather than solely for SERP feature visibility. Platforms like Apple and Microsoft demonstrate how forums can also serve as valuable customer support channels.

Geographic Prevalence and Query Intent

The "Discussions and forums" SERP feature is most prevalent in the United States, appearing in 11.7% of SERPs, followed by Canada at 10.7%. While the feature was found in numerous countries, its appearance varied.

Crucially, 98.7% of appearances within this SERP feature are for queries with informational intent. Commercial intent accounts for 40.9%, and navigational intent represents a mere 0.6%. It’s noted that keywords can have multiple intent classifications, leading to totals exceeding 100%.

The feature’s presence also correlates with query length. It is rare for the feature to appear for single-word queries (0.3% of appearances). Its likelihood of appearing increases significantly with query length, being approximately three times more likely for an eight-word search compared to the overall average. Queries with five or more words account for 43.2% of "Discussions and forums" appearances.

URL Specificity and Domain Authority

A significant finding is that 27 of the top 1,000 domains rely on a single URL for at least 10% of their overall presence in the "Discussions and forums" SERP feature. Furthermore, 768 of these domains depend on a single URL for at least 1% of their presence. Examples include a health question on Gleneagles Hospital’s website accounting for 67% of its appearances and a single, unanswered post on skill.jobs contributing 30% of its feature visibility.

The average Domain Rating (DR) of the top 1,000 domains is 58.3. DR is Ahrefs’ metric for backlink profile strength. While a moderate correlation (Spearman correlation of 0.38) was observed between prominence and DR, this was heavily influenced by the top-ranking sites. The top 100 domains averaged a DR of 78, while the bottom 100 averaged 48. Interestingly, no correlation was found between rankings and backlinks to specific URLs within the top 1,000 individual discussions; the top 100 URLs had very low URL Rating (UR) scores.

Strategic Implications for Communities and Brands

The extensive analysis of the "Discussions and forums" SERP feature underscores its importance in modern search. The dominance of established platforms like Reddit and the rapid growth of Facebook Groups highlight the value of community-driven content. Brands looking to leverage this feature should focus on actively participating in relevant communities, adhering to their etiquette, and providing genuine value. By engaging authentically, businesses can identify natural opportunities to connect with potential customers who are already discussing their products and services. Ahrefs Brand Radar’s Reddit-in-SERP index offers a tool to track mentions of businesses, competitors, and niches within this evolving search landscape.