So, a question was asked in one of my linkeddata discussion groups. How does linkeddata, bigdata, opendata and the semantic web fit together?

My answer:
The Semantic web is the interface to make sense of all of the data (bigdata) which has to be accessible (open data); linkeddata is the mechanism making the data connections which are interpreted by the semantic web.

A very simplified view, for sure but I think it sums it up in a sentence.