Sometimes you talk to someone (possibly online, usually about a shared interest), and they ask you what your thoughts are on X. Then you can just link them, if

Sometimes you talk to someone (possibly online, usually about a shared interest), and they ask you what your thoughts are on X. Then you can just link them, if you have written on X (or related). Sometimes others want to express a (non trivial) idea to someone else, and your writing may be the best thing they know that gets the message across. Then they can send it. Sometimes (or rather, always) your idea and writing is not the best or final thought you have on the subject. But it is not until someone has read and commented/replied (thoughtfully) that you understand what the next refinement is. And then there is serendipity, just putting it out there to see what might (or might not) come of it. Plus maybe one finds it motivating to have it actually accessible for others. As a clear goal and a standard to hold each piece to.