Interestingly, youtube did that on me for some time, then it stopped. It repeatedly unsubscribed me from channels I used to watch more often, but kept intact so

Interestingly, youtube did that on me for some time, then it stopped. It repeatedly unsubscribed me from channels I used to watch more often, but kept intact some subscriptions I didn't visit regularly. Facebook, by its turn, added some friends on my behalf. I was surprised some times to see a notification like "John Doe accepted you friendship request", but I'd never sent on. They also stopped doing that.