Which "things" constitute proper nouns is at least a bit ambiguous. In general, there's a tendency to capitalize new terms that haven't entered the broad lexicon. So, at various times, it's been common to see the Web, Big Data, Open Source, and so forth. The problem with doing things this way is that you either 1.) End up dropping the caps semi-arbitrarily at some point or 2.) you end up with sentences like "I commonly use Open Source Software on the Web to do my Big Data analyses."
