I like the idea, not sure how practical the applications are without more consensus on emotion scales and shared vocabulary of terms.

The primary goal of this proposal is to serve as a common protocol understood by all OpenSocial clients and servers. If this draft is adopted, it would replace the previously proposed GData-based OpenSocial data API.

This memo defines URI fragment identifiers for text/plain MIME entities. These fragment identifiers make it possible to refer to parts of a text/plain MIME entity, either identified by character position or range, or by line position or range.

This specification introduces markup based on existing standards for declaring that an XML document includes data compatible with RDF and for linking to algorithms (typically XSLT), for extracting this data from the document.

OpenID Attribute Exchange is an OpenID service extension for exchanging identity information between endpoints. Messages for retrieval and storage of identity information are provided.