I suppose replying is one legitimate way to mark interesting threads, but it seems that the suggestion is to reply merely for the purpose of marking them rather than that you actually have a response. I would hope people wouldn't do that. For me, that just clutters up the FOG and I would suppose creates the possibility that the volume of responses on the FOG will increase significantly just for the purpose of marking threads even if these responses are very small amounts of actual data.
I think saving the URL/link to a folder in your browser works very well. It works for me.
I think saving the URL/link to a folder in your browser works very well. It works for me.