[rcavezza]

RE: YC Tag - I think it is because Heroku was acquired.

[kmfrk]

Dropbox don't get the treatment either. It's not that I mind, it's just funny to see the irregularity of labelling.

Probably because people forget how many companies YC fostered.

[halter73]

Or perhaps Heroku and Dropbox are famous enough that posters assume people already know they were fostered by YC and don't tag accordingly.