In this video, we explore what domain expertise is and how it differs from reputation score on Steem.
A user's domain expertise is the total sum of author and curation rewards accumulated by the user over a period of time:
Note: Currently, the domain expertise is being calculated since the public launch of Waivio.com in June 2019. In the future, we plan to index the entire history of Steem blockchain.
Author rewards are proportionally allocated to the hashtags and object references made by users in their posts:
Curation rewards are also taken into account. Thus, if a user upvotes a post that has links to some hashtags, that user will begin to build expertise in those hashtags as well.
The domain expertise accumulated by users can be found on their profiles on Waivio:
The combined domain expertise of a user is equal to the sum of their expertise in all the different hashtags they have referenced in their own posts or indirectly upvoted.
For example, based on Steem blockchain records, we can estimate that for 
In a similar way, each hashtag on Steem now has the list of associated experts:
Looks like
has more expertise in #beer than ! And 
is already in the top 10!
As you can see, the domain expertise differs from the standard reputation score on Steem in many unique ways and it allows a much more granular analysis of users' interests.
Finally, the domain expertise can also be calculated for the hashtags themselves and it makes it easy to evaluate which topics are important for the Steem community overall:
We invite you to explore and browse hashtags on Waivio as well as check your own domain expertise on your your Waivio profile.
Please do not hesitate to ask questions, post comments and suggestions.
Also if you like what we do and if you think we deserve to receive some funding from the Steem Development Fund, please support Waivio on the Steem Proposals System. Every vote counts!
And just #keepsteeming!