Actually, it's a rather common phenomenon. A lot of internet hype with a good story can generate a great deal of volume. Greed is one factor, Individuals buying repeatedly as it goes up with volume. Professional traders will take advantage. Could also have been a fund or institutional buyer, deciding to take a substantial stake in a company with potential. I see no reason to assume there is PR on the way. A PR leak is probably common enough but is very far from being a sure thing.