A poster session is the right place to not only perform several times your elevator speech but also explain the abstract model of your research printed in an A1 paper sheet. Then after few times you find that your idea also inspires someone else and that short presentation became a chat with coffee and biscuits, at that time you realize your poster session was successful.
That was our sensation last October at the Royal Geographical Society in London, where we were invited to the closing meeting of the COST Energic Action IC1203 (European Network Exploring Research into Geospatial Information Crowdsourcing). Our two poster among 15 were visited and commented with multiple researchers, we also received multiple opinions, feedback from our ideas as well as invitations for visiting research teams for contrasting existing developments to improve ourselves.