How does Instagram work?
Instagram works by showing each user a mix of posts from followed accounts and algorithmic recommendations across several surfaces. Users publish photos, carousels and videos to a profile grid, post 24-hour Stories, and record vertical Instagram Reels. Private conversations run in Direct messages. In 2025 Adam Mosseri, head of Instagram since October 2018, said that messaging, Reels and recommendations drive most of the app’s recent growth.
The main surfaces are:
- Feed: posts from followed accounts mixed with suggested content.
- Stories: vertical posts that disappear after 24 hours.
- Reels: short vertical videos ranked mainly by recommendation.
- Explore: a discovery grid based on each user’s interests.
- Direct: private and group messaging.
History of Instagram: key dates
Instagram started as a simple iPhone photo app and became one of Meta’s three apps with 3 billion users. The table lists the milestones.
| Date | Event |
|---|---|
| 6 October 2010 | Kevin Systrom and Mike Krieger launch Instagram on iOS |
| 9 April 2012 | Facebook announces the acquisition for 1 billion USD in cash and stock |
| August 2016 | Stories launch |
| June 2018 | Instagram reaches 1 billion users |
| August 2020 | Reels launch as a response to TikTok |
| October 2022 | Instagram passes 2 billion users |
| 10 July 2025 | Public posts of professional accounts become indexable by search engines |
| 24 September 2025 | Instagram reaches 3 billion monthly active users |
Instagram users in numbers
Instagram’s ads reach more than one in five people on Earth. DataReportal’s January 2025 data shows an ad audience of 1.74 billion, equal to 21.3% of the world’s population, split 52.7% male and 47.3% female. The largest markets are India (414 million), the United States (172 million) and Brazil (141 million). In Poland, DataReportal’s Digital 2026 report counts 12.4 million people reachable with Instagram ads in late 2025, which is 39.5% of adults and 800 thousand more than a year earlier. Note that ad reach is not the same metric as monthly active users.
Instagram in marketing, SEO and AI search
Instagram matters to marketers because it combines paid reach, creator marketing and search visibility in one app. The sections below cover the three areas I see most often in client work.
Instagram ads
Instagram ads are bought in Meta Ads Manager together with Facebook placements. Formats include image, video and carousel ads in Feed, full-screen Stories and Reels ads, and placements in Explore. Retargeting audiences built with the Meta Pixel let you run remarketing to recent site visitors. I run these campaigns as part of Meta Ads services.
Instagram SEO and Google indexing
Since 10 July 2025, public photos, videos, carousels and Reels from professional accounts of users over 18 can appear in Google and Bing results. Instagram calls this setting “Allow public photos and videos to appear in search engine results”. Captions, alt text and the profile name now work like on-page signals, so a clear keyword in the first line of a caption helps both Instagram search and Google.
Instagram and AI search
Once posts are indexable, AI tools can read and cite them. Brands that publish clear, factual captions give these systems quotable material, which supports Generative Engine Optimization.
Instagram vs TikTok
| Feature | TikTok | |
|---|---|---|
| Owner | Meta | ByteDance (US: joint venture) |
| Formats | Photos, carousels, Stories, Reels | Mainly short video |
| Ad buying | Meta Ads Manager, shared with Facebook | TikTok Ads Manager |
| Poland ad reach | 12.4 million (late 2025) | 12.4 million (late 2025) |
Frequently asked questions about Instagram
Who owns Instagram?
Instagram is owned by Meta Platforms, formerly Facebook. Facebook announced the acquisition on 9 April 2012 for 1 billion USD in cash and stock.
When was Instagram created?
Instagram was launched by Kevin Systrom and Mike Krieger on 6 October 2010 as an iPhone app. Facebook bought it less than two years later, in April 2012.
How many people use Instagram?
Instagram passed 3 billion monthly active users in September 2025, according to Mark Zuckerberg. DataReportal measured an ad reach of 1.74 billion people in January 2025.
Do Instagram posts show up on Google?
Yes, since 10 July 2025 public posts from professional accounts of adult users can be indexed by Google and Bing. Account owners can switch this off in the privacy settings.
Related terms
- Instagram Users, Stats, Data & Trends · DataReportal
- Digital 2026: Poland · DataReportal
- Three out of three for Meta as Instagram tops 3 billion · Mobile Ecosystem Forum
- Instagram content becomes searchable on Google starting July 10 · PPC Land
- Instagram · Wikipedia
