I've read a bit about Santiment. It's a financial market data and content platform of choice for cryptocurrency and block chain space. Santiment provides aggregated newswires regularly. Are you planning to do something similar?
We will provide a sentiment analysis widget (actually, it is already available in our demo!), that in its final version will aggregate opinions on the project from different social networks (although right now only BTT is available, other social media is planned as well).
As for Santiment, they aim to build decentralized prediction models, but it is unclear how they are going to decentralize such massive computations (and it is not covered in depth in their WP). The key principle of Dolphin platform is that widgets may be centralized (as they often need a lot of computational power), but the economics around these widgets are decentralized, which allows to create a truly honest and transparent marketplace of analytics.