Twitter lowers the number of accounts a user can follow per day from 1,000 to 400 to cut down on spam and bot activity
a clear signal that inorganic follows are super annoying. Yoel Roth / @yoyoel : Certain types of inorganic follow behavior, like follow churning (repeatedly following and unfollowing the same account in the hopes of growing your followers), are prohibited in the Twitter Rules. So we looked for thresholds of follows per day from the accounts that did this. Yoel Roth / @yoyoel : 99.87% of Twitter users are totally unaffected by this lower rate limit. Most people don't need or want to follow that many accounts. But some legitimate accounts, like businesses providing customer service by DM, actually do need it, and we want to avoid burdening them. Frederic Lardinois / @fredericl : Yeah, that'll fix the problem. All regular users follow 399 accounts a day, right? http://techcrunch.com/...
Context & Ripple Effects
In April 2019, Twitter trust-and-safety lead Yoel Roth framed the new 400-follow daily cap as a threshold problem, not a policy change: the team studied accounts practicing follow churning — mass following and unfollowing to inflate follower counts — and set the limit just above legitimate behavior, leaving what he put at 99.87% of users untouched. The trade-off he flagged was real: businesses using follows to open customer-service DM conversations sat near the ceiling.
That lever did not stay a one-off. By mid-2023 Twitter was applying the same rate-limit logic to direct messages, with daily DM caps that exempted paying Twitter Blue subscribers, while Meta's Adam Mosseri reported spam attacks on Threads picking up and responded by tightening rate limits there too. The 2019 follow cap reads now as an early instance of what became the industry's default anti-spam instrument — and, eventually, a feature worth paying for.
First-order effects
- Follow-churning growth accounts and the automation tools driving them lose most of their headroom overnight, since the technique depends on cycling hundreds of follows per day.
- Legitimate high-volume followers — customer-service operations that follow users to open DM threads, as Roth noted — are the collateral cost, forced to ration outreach or shift to other channels.
Second-order effects
- Third-party follower-growth services built on bulk following see their core mechanic throttled, pushing that gray market toward purchased accounts and engagement pods instead.
- By demonstrating that blunt numeric caps can catch abuse without touching ordinary users, the move normalized rate limiting as moderation — the approach Twitter later extended to DMs with a paid exemption and Meta replicated on Threads.
Third-order effects
- If the pattern holds, behavioral caps become a structural layer of platform economics rather than just safety plumbing: access thresholds turn into tier boundaries, so the ability to act at scale is something subscribers buy back — a shift from moderating bad actors to metering everyone and discounting the verified.
- Spam control also becomes a measurement battleground: Twitter's own claim of removing over a million spam accounts daily while resisting external audits shows why platforms prefer internal thresholds whose enforcement data they alone can verify.
The trend: Platform anti-spam strategy is converging on universal rate limits enforced by opaque internal thresholds — and increasingly monetized through subscription tiers that restore the capped behavior.