IM online on the PC and find that in the devices section online at Sony network options I have 4 devices added to my account 'ps3s' how the hell? It said I have reached the maximum for videos?! I Havana had 4 ps3s?!
For video you can only have one PS3 active. It's possible no one shared. Any time you log into your account on a PS3 it registers. So say you went to a friends house and logeed in on your account to check out the store or play COD because their internet is faster. That counts as an activation and you haven't shared anything. You can deactivate on the console if you know which ones it's active on or you can do it via PC with the link I'll provide. This can only be done once every 6 months.