Initiated by Manuel Zacklad in 2003, the 'Socio-semantic Web' has recently seen important developments. Contrary to the Semantic Web, it is not interested in formal semantics but in semantics dependent on the human subject and on the semiotic substrate. Moreover, it aims at fostering people participation in knowledge work, such as Web 2.0 does for entertainment. In this trend, software design relies on three human and social phenomena: • documents, because they are proofs of something else, not in the manner of a mathematical proof but more in line of evidence that is kept and that can be mobilized; • interpretation, because the meaning of a document depends on its authors and readers; • intersubjectivity, because the confrontation between conflicting interpretations allows to overcome subjectivity. We illustrate our definition and design approach with descriptions of a course-material sharing platform and of a software enabling collaborative analysis.