I see that there is now a button at the top for a link to RSS feeds for Mudcat. This is quite different than "social networking", but I doubt that many will be interested in it....and perhaps many have no idea WHAT it is...
here is a general outline

I use RSS in standalone programs called "news aggregators" which allow one to subscribe to a wide range of 'feeds' on various topics. One can get instant updates on topics of interest without seeing 'everything' a site..(often a newspaper or magazine)..might have available. here is just one of many such 'readers'. And here is another. These can be VERY useful for those who wish to follow specialized topics such as tech stuff, political news...etc.
I suppose that this would allow you to get updates on Mudcat threads of interest thru your email, or by opening it in some RSS aggregator...(these are built into some newer browsers, though I personally prefer dedicated, stand-alone programs for specialized tasks.)

   I will possibly try out the Mudcat feed(s) and see exactly what it does....if I learn anything of interest, I will report back.