TikTok tests every new video on a small group of viewers, measures whether they watch it to the end, share it and rewatch it, and shows it to a bigger audience only if that first group responds well. Follower count is not a direct ranking factor. Each video is judged on its own.

The top guides agree on the three signal groups but none of them works a full test-group example with numbers. One guide lists TikTok's six-step Creator Academy process without showing what the numbers look like. Another names watch-through rate as the strongest signal but gives no completion percentages to aim for. A third describes the test loop but never compares a video that expands with one that stops. This guide runs both videos through the same numbers.

TikTok's own help pages sort the signals into three groups. User interactions count most: what people watch, finish, like, share, comment on, save and search for. Video information comes next: captions, sounds, hashtags and on-screen text. Device and account settings count least: language, country and device type. TikTok also confirms that follower count and past hits are not direct factors.

Worked example: take two 30-second videos, each shown first to 300 people. Video A is finished by 240 of them, an 80% completion rate, and shared by 36, a 12% share rate. TikTok expands it to 3,000 viewers, then to 30,000 if the pattern holds. Video B is finished by 120 of them, a 40% completion rate, and shared by 3, a 1% share rate. TikTok stops showing it. The difference is not the topic. It is 240 finishes and 36 shares against 120 finishes and 3 shares.

Guides that track the platform report the first test group is 200 to 500 views. Views under 5 seconds count as low-quality skips and hurt the video. Guides also report a completion threshold of around 70% as the level that earns expansion, though TikTok does not publish that number itself. Shares and saves outweigh simple likes in the engagement order, and finishing a longer video is one of the strongest signals TikTok names.

The algorithm also decides what it will not show. It does not recommend duplicate content, spam, content you have already seen, or videos still under review. Reused clips without creative edits and clips carrying another app's watermark are ineligible for the For You feed, and an account that keeps posting them stops appearing in the For You feed at all.

Search is now part of the algorithm. TikTok reads spoken words through auto-captions and on-screen text, and matches videos to search queries. A video that answers a question in words on screen can keep being found months later, long after its first For You push has ended. That is why captions and spoken keywords matter as much as hashtags now.

Q: How does TikTok decide which videos to show me?

A: It predicts whether you will watch, finish, like, share or skip each video, based mostly on your past interactions, then on the video's information, then on your device and account settings.

Q: Does having more followers help a video go viral on TikTok?

A: No, not directly. TikTok says follower count and past hits are not direct ranking factors. Each video is tested on its own audience response.

Q: What is the most important TikTok ranking signal?

A: Watch time and completion rate. If people finish your video, TikTok shows it to more people. Shares and saves matter more than simple likes.

Q: How many views does TikTok test a new video with first?

A: Guides report a first test group of about 200 to 500 views. How those viewers react decides whether the video expands or stops.