Booksumo is another publisher I tend to ignore (seriously, how can "chef maggie chow" have time to cook, as many books as she is writing?). At least they do have a website -
http://booksumo.com/ - even if most of their pages just link to Amazon, rather than to their own maintained pages (if you were a real publisher, would you rely on a single retailer to maintain your web presence? to display to your potential authors what you do? Oh wait, they don't have much of anything there for authors, although you can find an email address, if persistent. Their "blog" seems to have not been updated since Fall of last year, also, with every post I checked dating from the first couple of weeks in Oct 2016 or the very tail end of Sept 2016.