Steemit was launched in 2016. It was the first application built on the Steem blockchain. Steemit is the first decentralized social media or publishing platform in the history.

It has Delegated Proof of Stake (DPoS) mechanism which protects the blockchain. The contents published are immutable here. The native digital asset of Steemit is Steem token as it runs on Steem blockchain. Steemit rewards content creators, curators and remitters.
Steemit has ‘Proof-of-Brain’ mining system which allows people to earn fast and feeless Steem tokens (payment happens in terms of liquid Steem token, Steem blockchain dollar or SBD and vested Steem called Steem power).
A writer is rewarded when his/her content is upvoted as the content creates more value to the platform. The voters are also rewarded for creating engagement in the platform by curating and upvoting contents. It has been already proved that Steemit can handle high traffic and is extremely scalable.
Image Source – Alexa Analysis | Audience geography – Steemit

What I like in Steemit

True decentralization: Steemit is completely decentralized. It is totally driven by community members. Contents are censorship free.
Community engagement: Steemit is an excellent example of focal point of game theory where a community coordinates without explicit coordination. Just imagine two bicycles heading towards each other and going to crash. Now avoiding collision becomes a coordination game.
One player can go right or left but he doesn’t know what the other player will do. Only aim is to avoid crashing. Ultimately one player decides to go to the right direction which serves as a focal point and leads to the winning right-right outcome.
It appears to be a natural focal point using right-hand traffic. Steemit is operating since long time without intervention of any regulator.
Flourishing dapps: So many dapps are being built in the Steem platform. There is Youtube alternative D.Tube, fitness dapp Actifit and Instagram alternative APPICS etc. Partiko and eSteem are applications built on top of Steem blockchain for Android and iOS devices, offering unique features to your daily social interactions and earning rewards. As these dapps are attracting good public attention, the interaction level in Steemit has increased a lot.
Transparency: There is no doubt that Steemit is extremely transparent. You can view all details in the blockchain. It does not hide anything from you.
Private wallet: Steemit has private wallet and you have full control over your fund.

Image Source - Posts in Steemit website

Grey areas of Steemit

Bot voting: Bid bots almost demolished Steemit by selling votes. Newsteem has banned vote selling bid bots technically but automated voting is a huge problem of Steemit. Steemit simply allows a user to automate voting by following certain criteria.
So you will find many users who vote in Steemit without even reading or login. There are so many bots deployed also which keep on voting just for the purpose of generating return on investment.
Abundant shit posts: Shit posts are abundant in Steemit. Some shit posts even earn good amount as the writer is part of big Steemit communities.
Downvote battles: Steemit also has downvoting option. Downvotes are meant to keep the platform spam free but often we see downvote battles between different communities or members.
Complicated system: Steemit is extremely complicated for a new user. If you have nascent or nil idea about Blockchain and cryptocurrency, you’ll find the mechanism difficult. Steemit provides so many keys with different rights for different purposes.
Limited earning period: Posts here earn only for first 7 days. Earning cycle is very less. Small earning cycle is supposed to produce motivation for generating more contents as per the founders.
Poor ranking by search engines: The web search engines like Google generally do not rank the posts higher when you search with even perfect key words.
Unstable value of Steem: Steem is presently trading at 0.12$. In 2018, it was trading in the range of 2$ to 6$. The price fluctuation forced many users to leave the platform.