Yup, certainly true. In fact, the post alludes to the fact that tweets, being transitory in nature, may not be a great venue for marketing pushes like this...

Yup, certainly true. In fact, the post alludes to the fact that tweets, being transitory in nature, may not be a great venue for marketing pushes like this... they're just too ephemeral in time for them to translate into real sales conversions. There's a reason why marketers on the internet and television see value in customers receiving multiple impressions... it helps to deliver and then reinforce an otherwise transitory message.