Fundamentally the company is just not performing really well, especially since a limited outlook on user growth has been given. Most important was that the base of users would increase in the low double-digit percentages for the rest of the year. Problem overall is that no hard and fast guidance was given during the earnings call.
Technically however, we seem to be on a nice buying point. Twitter made similar dives in the past as a result of an earnings call and came back stronger both times. Add to that reaching the 200MA and we have a solid risk-reward opportunity.