Discussions and Forums SERP Feature Analysis Reveals Dominance of Reddit, Rise of Facebook, and Niche Forum Visibility

A comprehensive analysis of 145 million US Google search results has revealed the significant presence and dynamics of the "Discussions and forums" SERP feature. The study found this feature appearing in 16.93 million, or 11.7%, of all analyzed US search results. Reddit.com emerged as the undisputed leader, featuring in 87.8% of these specific SERPs in the US and 83.9% globally, with an average of 1.29 link appearances per SERP.

In collaboration with Ahrefs’ data scientist Xibeijia Guan, the research aimed to map the prominence of various domains, identify emerging forums, and understand the influence of backlinks on these search results.

Key Takeaways:

Reddit’s Pervasive Influence: Reddit.com consistently appears in search results, showing up in 83.9% of SERPs globally whenever the "Discussions and forums" feature is present. Early data for August indicated a slight increase, with Reddit appearing in 86.1% of results so far. This popular discussion platform was the most prominent domain in 34 countries and ranked highly in others, such as India and South Africa, where Quora and Facebook respectively held more prominence.

An investigation into the top 100 most prevalent subreddits revealed that their average age was 16 years and 1 month. The youngest subreddit identified was r/ScienceBasedParenting, established 8 years ago. The subreddit with the fewest members was /r/backpain with 81,027 members, and the one with the fewest weekly visitors at the time of analysis was /r/wichita, a community for residents of Wichita, Kansas, with 42,000 weekly visitors. No surprising new or inactive communities significantly outperformed established ones in the top 100, indicating that while smaller, newer communities can appear for niche topics, they do not dominate the broader landscape. Ahrefs Keywords Explorer can be utilized to identify prominent communities and subreddits relevant to specific industries.

Dominant Platforms in the Discussions and Forums Landscape: Just three websites account for a substantial 76.75% of all "Discussions and forums" link appearances worldwide. The top 10 domains collectively captured 84.87% of all links, with the top 100 domains contributing 91.51%. Domains ranked between 501 and 1,000 contributed a mere 1.49% to overall visibility, and the top 1,000 domains accounted for 96.81% of mentions.

Facebook’s Ascendancy: Thanks to its "Groups" feature, Facebook has become the second most prevalent site overall in the "Discussions and forums" SERP feature. In the US, Facebook appeared in 38.3% of all instances of this feature, a figure consistent across all countries. Public Facebook Group posts, which officially launched in October 2010, were the source of all Facebook URLs appearing in search results. The research noted instances where Google appeared to be directly indexing AI-generated page headlines from Facebook. The top 10 Facebook posts appeared for a combined 4,936 queries. The top 10 Facebook Groups accounted for 2.82% of all Facebook’s link placements within this feature, and the top 100 for 9.27%. Facebook surpassed Quora in the number of search results it appears in earlier this year. While official figures are not disclosed, online estimates suggest between 10 million and 70 million active groups on the platform. Facebook was 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’s Consistent Presence: Quora secured its position as the third most prominent site, appearing in 8.22 million search results and covering a wide range of queries, from medical inquiries to technical questions. Some of its most prominent threads focused on where to watch movies online. A significant observation was the presence of Quora’s AI Assistant’s top answers in numerous threads, indicating its growing integration. The platform, like others, faces the challenge of distinguishing genuine user interaction from self-promotional content.

Top 25 Domains in Discussions and Forums SERPs: The analysis identified the top 25 domains most frequently appearing in the "Discussions and forums" SERP feature. Reddit.com led with 21.77 million SERP appearances and an 84.71% share. Facebook.com followed with 9.84 million appearances (38.29%), and Quora.com with 8.22 million appearances (31.96%). Other prominent domains included JustAnswer.com, MayoClinic.org, StackExchange.com, TripAdvisor.com, Practo.com, Steamcommunity.com, and Gamespot.com.

Domain Age and Longevity: The average age of the top 1,000 domains analyzed was 21 years and 8 months. The youngest domain with a verifiable registration date was guitar community The Gear Forum, at just under four years old. While XDAforums.com technically showed a registration date under three years, it was a product of a redirect from forums.xda-developers.com, indicating its actual operational history is longer. The research emphasizes that these ages do not account for forums built on domains at a later date or those redirected from elsewhere. The advice for launching new forums is to do so based on genuine interest and perceived opportunity, rather than solely for SERP feature visibility. Companies like Apple and Microsoft also utilize forums effectively for customer support.

Geographic Prevalence and Search Intent: The "Discussions and forums" SERP feature is most prevalent in the United States (11.7% of SERPs) and Canada (10.7%). Among countries where the feature appeared for at least 10,000 individual queries, the US showed the highest prevalence. The vast majority of these appearances, 98.7%, are for queries with informational intent. Commercial intent accounts for 40.9%, while navigational intent is minimal at 0.6%. Keywords can have multiple intent classifications, leading to totals exceeding 100%.

Query Length and Feature Appearance: The "Discussions and forums" feature is rarely seen for single-word queries (0.3% of appearances). Its presence scales with query length; it is approximately three times more likely to appear on an eight-word search than across all queries. Notably, 43.2% of these appearances are for queries comprising five or more words.

URL Specificity and Backlink Influence: A significant finding is that 27 out of the top 1,000 domains rely on a single URL for over 10% of their presence in this SERP feature, with 768 domains relying on a single URL for at least 1% of their overall visibility. Examples include a health question on Gleneagles Hospital’s website accounting for 67% of its appearances and a single, reply-less post on skill.jobs from 2020 accounting for 30% of that domain’s SERP feature presence.

The average Domain Rating (DR) of the top 1,000 domains was 58.3. While a moderate correlation (Spearman’s rho=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 URL Rating (UR) scores for the top 100 URLs were uniformly low, with none exceeding 5.

Conclusion and Recommendations: The extensive analysis highlights Reddit’s ongoing dominance and Facebook’s rapid growth in the "Discussions and forums" SERP feature landscape. The reliance of some sites on a limited number of URLs for their visibility is also a notable trend. For businesses aiming to leverage this feature, using tools like Ahrefs Keywords Explorer to identify relevant subreddits, groups, and niche forums within their industry is recommended. Engaging authentically within these communities, rather than resorting to spam or self-promotion, is crucial. The presence of discussions about products and services within these forums offers natural opportunities for involvement. Ahrefs Brand Radar’s Reddit-in-SERP index can also be used to track mentions of businesses, competitors, and industry topics.