I think that it can be a pretty big hit for all those people that are just using their phone for Facebook and Instagram, it’s btw the first phone to come with Instagram pre-installed. Perhaps not so strange since facbook now owns instagram.
And what most people missed is that it’s just running the facebook home launcher, you have NO Sense on it at all. It’s stock jelly bean, it’s NOT “Pure” asop jelly bean from google though. All updates will still have to go through HTC. But, since you can pretty easy disable Facebook Home on it I think that there’s an audience for it outside the regular facebook/instagram people as well.