  Numerous logics have been developed to reason either about threshold-induced
opinion diffusion in a network, or about similarity-driven network structure
evolution, or about both. In this paper, we first introduce a logic containing
different dynamic operators to capture changes that are 'asynchronous' (opinion
change only, network-link change only) and changes that are 'synchronous' (both
at the same time). Second, we show that synchronous operators cannot, in
general, be replaced by asynchronous operators and vice versa. Third, we
characterise the class of models on which the synchronous operator can be
reduced to sequences of asynchronous operators.
