My intention is to say that systems of a particular type allow users to express ideas on them. I wanted to give the concept a more concise/general name, as a title for such systems. I called them ...
Can I use drop to say I will leave something somewhere? I will drop the books at your house. I will drop off the books at your house?
Let's say I'm describing what some person is currently doing, and I say: He is reading articles which he is summarizing in his blog. Is this sentence (and specifically, this usage of "which") ...