Absolutely true. Some of the celebs on FB post themselves, and every time it's not them the post begins with "From Admin:". But there is no space for that on Twitter for example.
I followed Randy Couture's Twitter for two days. After three blatant marketing tweets I unfollowed. Then it might be better they way Sly does it: radio silence when there's nothing to say or he's busy with something else.
I think the translation you're looking for is "coy". But I wouldn't bet on that since I'm translating from one non-native language into the other.
