First of all we already have topic thumbnails you can enable it from the ACP.
If that isn't enough you can take a look at the code that makes it work and duplicate that.
My nodebb gets stuck on "connecting" or waiting for domain .. but only after a few hours of running.
Then i get this error and can't connect again unless i restart nodebb manually http://puu.sh/cr70u/6221ecba0b.png
Any ideas? Im not running a proxy or anything, just changed nodebb to run on port 80.
@chas Need more info...
./nodebb dev and post any warnings or errors you get.