Yesterday, news broke that "thousands" of PSN accounts, mostly/all UK accounts that had recently bought items off the PSN using Paypal, had been subject to a ban due to a reported error on PayPal's end, triggering mass chargebacks (Thanks, Kotaku). The cause for the as-of-now random chargebacks is currently unknown.
For those unaware, Sony policy means that any account which has a user issuing a chargeback will automatically be banned until players can "pay back" the money equivalent to the chargeback. Since these PayPal chargebacks are random and weren't done at the user's discretion, these affected PSN accounts will be suspended until all affected parties can reach a conclusion to the issue. According to GameSpot, those users afflicted with a ban should be expecting an email from Sony shortly. An exact number count for the users affected isn't yet known, and neither Sony nor PayPal have yet to release a public statement about the current situation.
Exactly who is to blame for the matter is still unknown (both Sony and Paypal are pointing the finger at the other), and while there are reports of some users being unbanned, others are also still finding themselves banned.
TechRaptor will keep an eye on the situation, and report back once we have learned more.