Is this still possible now? And how?
Yes of course it's possible you to earn bitcoin especially nowaday through your twitter account by join or participate their campaign, there's a lot of campaign in service section that pay's you a bitcoin.
There are some altcoins campaigns that pay to participate through Twitter you can try them .
Yes your right there's so many altcoin campaign in service section that pays altcoin or bitcoin. But the payment depend on you real follower and it's not a big profit.