I don't see anything wrong of taking off Facebook/Twitter some days (especially, because I don't use it) but personally, I see there is a problem with taking a break of social media service called GitHub. I know many companies and organizations that use GitHub service as their git repository hosting, so 48h break would actually mean a two days off work for their employees [0].

[0]: ... as long they won't switch to other git hosting or implement some proxy, but it does not count.