I'm going to add another aspect or two I didn't really see when scrolling through the other answers.
When you post something on a blockchain, you can't set it to be only seen by a certain group of people - it can easilly be accessed by your foreign relative's neighbor's perverse uncle or the guy who murdered eleven people on the other side of the world.
Sure, on some front-end there might be settings for visibility but if you have the right skillset and knowledge, you can still easilly dig up whatever you want to see.
On Facebook, you can set your posts only to be seen by a certain group of people, exclude some of your friends one by one, post to all friends, friends of friends or everyone.
Editing / Deleting posts
The blockchain preserves all the information it gets permanently. Once posted it can not be deleted. It can be taken off the front-end as long as it has 0 votes and 0 comments but beyond that you're doomed if you want to delete something.
One can edit a post 7 days from publishing but the original post with all its edited versions can still be seen with the right skillset and knowledge. With HardFork 20 the developers removed the 7 day editing limit. I'm not sure it works yet, though.
On Facebook you can see if someone edited a post and what changed but you can also delete posts entirely.
1. Only very few people even know about blockchain-based alternatives to centralized social media.
2. Many of those who are told about a blockchain-based alternative that pays for activities in cryptocurrency think it must be a scam. Others think they wouldn't be able to earn very much on it anyway - and they would be right unless they had influential friends to onboard them.
3. Facebook is designed to be as addictive as possible,
4. Most Facebook users have all their friends and relatives on Facebook which means they have a social network in place. Starting from scratch would be lonely and would also involve a lot of work. Steem is a very complicated and confusing place for a newbie.
5. The fear of the unknown. The entire concept of Steem is totally new. That kind of thing scares people.
More than 10 years ago when I started using Facebook. To be honest, I joined the website not to socialize. Rather, to play Farmville which I believed helped Facebook gain more users. However, time came when I became more involved in socializing. Admit it, Facebook is addictive. That might be one reason why people can't let go of Facebook. Admit it or not, the thought of being the number 1 social media has its huge effect on people.
Looking back, there's a site which was marketed as paying social networking site called Klikot. I joined in referring some members, and many did not believe in me. It is pretty clear that majority of people do not believe that a person can earn from social media sites. When a social blogging website Bubblews came put, I didn't bother referring people because many will think it is a scam especially when the website turned a downfall. I didn't refer other members when new paying websites came out.
On Facebook, there's now expectation of earnings, but people can enjoy it. On paying social media sites, there is expectation of payments. When the website stops paying, they will leave it but they will stay in Facebook. The websites functions differently, and Facebook is user-friendly and most used, that's why people are sticking with Facebook.
Facebook is easy, semi-intutitve, and has a large marketshare of unique accounts. My grandfather can figure it out and remember his password. It is centralized so if there is a problem with his account he can ask Facebook inc. for help.
The steem block chain has multiple points of entry or use which is cool because you can use it for many different applications but all of those points of entry make it very confusing for a first time user. The fact that there are at least 4 different types of password for your account on the block chain makes it very confusing until you have had some experience with it. The really long password is a turn off for posting and liking things. a facebook password can be super small 8 keys or less if you want.
People like the illusion that when they delete something on facebook it goes away forever.... the block-chain is scary to some because it tracks your every interaction.
There are several reasons why people are still on Facebook, even if it doesn't pay.
First, it is hard to make a change. A lot of the people on Facebook may be hesitant to leave one platform where they have relative success, despite not earning anything tangible, to venture into a new platform.
Second, let's admit it. Steem and a lot of other blockchain-based social media sites are not really very popular. So, it's not so much a specific Steem problem, but a general cryptocurrency adoption issue. It's very possible that they have no idea that there is an alternative to Facebook. Also, there isn't really a lot of marketing going on for Steemit, and the few that I've seen marketing Steemit makes it look like a "get-rich-quick" platform, which may be turning off a lot of bloggers.
Finally, I've seen some mainstream Youtubers and Social Media Influencers try and fail here at Steemit. Maybe because, while the idea is the same, Steemit and Facebook are both social media platforms, after all, the similarities end there. A lot of tactics that would work in Facebook just don't work here, so I feel like the few Facebook users who gave Steemit a try, then crashed and burned, and just went back to Facebook.
People and various organizations resort to various social media platforms for specific reasons. My church, for instance, still uses Facebook because majority of the congregation are on that platform. Hence, it is easier to reach out to them with important announcements, livestreams of church services and many others. Imagine if we were to livestream our church programs on Dlive, how many members of the church would have the opportunity to watch it. I'm even very affirmative about the fact that a significant percentage of the congregation have never heard of Dlive . In summary, cryptocurrencies and their platforms have not been completely accepted by societies and people. Also, not just everybody wants to make money off their post, some just want to reach out to their loved ones and pals. So until their friends and families populate these decentralised platforms, they have no reason to join. I hope this answer helps in a way
This is because of the following reasons:-
Thank you and Have a great day
Because the majority of people are ignorant to the alternatives that are out there, and also ignorant to how much data that Facebook collects and sells from people. The old saying 'Ignorance is bliss' seems to fit well with this question.
I also think when people look at blockchain alternatives like Steem they are skeptical because they dont understand it.
It is basically Stockholms syndrome. They are trapped in an abusive relationship with facebook but they continue think they can change them. Facebook will continue to use them till their is nothing left to take from them then discard them like trash.
It's not as simple as it seems. I don't think it's a matter of habit, but ease, people who have a lot of time with Facebook accounts find it hard to connect with all their friends. Especially in other platforms like Steemit.
There are also other factors that keep the new users away and I tell you because I have lived in my own experience. the quality standards are really demanding in this type of social networks.
While on Facebook you can post what you want whenever you want and this is very difficult to overcom. specially when you are limited to bandwidth or credit resources and you can only publish every certain time. and also your Publications by failing to meet high quality standards do not receive votes.
and therefore do not earn rewards.
All this is what demotivates new users and leave the platform before even build a reputation in it and be able to have greater freedoms.