I've never seen anyone put a live link in the summary - it's located in the bottom right of the listing - it looks like a link to your homepage but it's a deep link to the article. I would imagine that the editor strips html out so links wouldn't be allowed but I've never tried.

I've also never checked on how long it takes to show up but I would imagine it's like most sites and shows up immediately. It is a little difficult to search propeller but there's a light blue box mid-right sidebar that allows you to narrow to a subject; the box is labeled Channels

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