Many apps have their own Twitter accounts and companies their own Facebook pages to help you keep up to date. Reinvented Software’s apps have been on Twitter for a while, but I’ve never really promoted them.
Here are the Twitter accounts for each of the apps:
Following these can be especially useful if you’ve purchased any of the apps through the Mac App Store, as a tweet will go out once new versions are approved. This is the only place on the web where that happens.
All of these have a pretty low volume of tweets, mostly about updates and the odd vaguely relevant retweet.
Reinvented Software also has its own page on Facebook, which you can “like” to see updates much the same as the ones posted on the News page here. The frequency of updates is pretty low.
Feeder and Poster are also Facebook apps and have their own pages as a result, but there are no updates on there at the moment, so you can “Like” them, just to show that you, er, like them.