No, they could be completely different demographics. I'm personally much more likely to follow a twitter account I see in an advert (if it interests me) than a

No, they could be completely different demographics. I'm personally much more likely to follow a twitter account I see in an advert (if it interests me) than a random account that favorites a tweet (which I will 100% ignore). There may also be people out there who are happy to follow anyone who favorites their tweet, but aren't at all desirable to advertisers and don't get shown that many adverts. This isn't exclusive to Twitter. Not every person is worth the same value to advertisers. I advertise on platforms ranging between $0.20/click to $1.50/click, and different platforms offer different value per click.