SEO Daily News Recap for Sunday, December 21, 2025
Organic SEO & Search News
Google December 2025 Core Update Volatility – Google’s latest core update has caused significant volatility in search results, impacting websites across various industries.
The coming AI security crisis (and what to do about it) – Security researcher Sander Schulhoff highlights the challenges of AI security and provides insights on how to secure AI products effectively.
Paid Search & Platform Innovations
LinkedIn Shares Tips on How to Boost Your In-App Performance in 2026 – LinkedIn offers valuable insights and tips to improve performance within the app based on the latest usage trends.
TikTok Announces Expanded Partnership with International Ski Federation – TikTok’s partnership expansion with the International Ski Federation reflects the growing interest in Winter sports content on the platform.
General Digital Marketing
X Shares Most Discussed Topics of 2025 – X provides insights into the trending topics of the year, offering valuable data for marketers to leverage in their strategies.
X Adds New Creator Studio Hub on Mobile – X introduces a new Creator Studio Hub on mobile, enhancing creators’ ability to track growth and monetization opportunities.
X Shares ‘Q5’ Marketing Insights and Tips – X reveals marketing insights and tips for leveraging post-Christmas conversations and trends to drive engagement and conversions.
Dive into our detailed sections for more insights and updates.
Organic SEO & Search News
SEO Daily News and Algorithm Updates
X Shares Most Discussed Topics of 2025
Some insights into the most discussed topics in the app this year.
Source:
Social Media Today – Latest News
X Shares ‘Q5’ Marketing Insights and Tips
X says that a lot of popular topics see more conversation post-Christmas.
Source:
Social Media Today – Latest News
Google December 2025 Core Update Volatility Saturday, December 20th
As you all know, Google announced the Google December 2025 core update on Thursday afternoon, December 11th, we saw some significant volatility hit early on December 13th and then it seemed to cool a bit towards the middle of the week. Now, I am seeing signs of more intense volatility hit on Saturday, December 20th.
Source:
Search Engine Roundtable
Technical SEO
The coming AI security crisis (and what to do about it) | Sander Schulhoff
AI guardrails don’t work. Security researcher Sander Schulhoff on prompt injection, red teaming, why AI defenses fail, and what actually secures AI products.
Source:
Lenny’s Newsletter
SEO Tools and Data Analysis
X Adds New Creator Studio Hub on Mobile
A new way to keep tabs on your growth and monetization potential.
Source:
Social Media Today – Latest News
Career Development and Industry Trends
LinkedIn Shares Tips on How to Boost Your In-App Performance in 2026
LinkedIn has also shared stats on latest usage trends to reinforce its notes.
Source:
Social Media Today – Latest News
User Experience and SEO Optimization
TikTok Announces Expanded Partnership with International Ski Federation
Interest in Winter sports is rising in the app.
Source:
Social Media Today – Latest News
Job Postings
Job Postings
12/21/2025
Sr. Website Performance & Optimization Manager ~ Smarsh ~ In-office (USA) ~ Atlanta, GA, United States
Who are we? Smarsh empowers its customers to manage risk and unleash intelligence in their digital communications. Our growing community of over 6500 organizations in regulated industries counts on Smarsh every day to help them spot compliance, legal or reputational risks in 80+ communication channels before those risks become regulatory fines or headlines. Relentless innovation […]







