要点In short
- LINE reaches 74.7% of Japan across every age group — it functions as infrastructure, not as one messaging option among many.
- YouTube follows at 56.8%. Facebook is not a primary channel here, and LinkedIn is niche.
- Purchase decisions are settled on review platforms — 価格.com, 食べログ, @cosme for consumers; ITreview and BOXIL for B2B.
- Claim and populate the platforms before advertising to them, or the ads point at an empty profile.
In most markets, messaging apps are a private channel. In Japan, LINE is where customer relationships live — official accounts, rich menus, automated sequences, and CRM are built in. Treating it as an optional add-on means being invisible in the place Japanese consumers actually look.
The ecosystem around it
LINE leads, with YouTube second at 56.8%, then Instagram and X. Facebook is not a primary channel here. But discovery isn't only social: purchase decisions are settled on review platforms — 価格.com, 食べログ, @cosme for consumers; ITreview and BOXIL for B2B.
What foreign brands should do
- Set up and brand a LINE Official Account as a core channel, not an experiment.
- Use rich menus and step messages to guide the long Japanese consideration journey.
- Claim and populate the review platforms that matter for your category before running ads to them.
- Treat YouTube as the demo and reassurance layer, especially for considered purchases.
The platforms are different, so the playbook is different. Presence on Japan's own ecosystem is a prerequisite for everything that comes after it.
Sources
- 01ICT Research Institute, platform usage survey (Dec 2024, n=4,225)
- 02LINEヤフー Corp. official figures / Business of Apps, 2025–2026
- 03Kakaku.com, Inc. IR materials (Sep 2025 and Dec 2025)
- 04ICT Research Institute, Dec 2024 (n=4,225)
Takato Minemura — Founder, JIN MARKETING
Takato Minemura is the founder of JIN MARKETING and runs WINDE, a development company in Japan. Educated at university in the United States, he spent years working alongside businesses abroad, where the same request kept arriving from the founders he worked with — we want to bring this to Japan, how does it actually work there? Answering that question repeatedly showed him something he had not expected: what he had treated as ordinary common sense about marketing was in fact specific to this market, and the companies committing the most money to an entry were the ones least aware of it. He works on both sides of an entry, the strategy and the code that implements it, which is why the research here comes out of projects rather than desk study. More about the author