For magic to be revealed and accepted, you would need:
- A good amount of influence, as already stated by Bwrites, since you need a vast majority of the public informed that something unexplainable can happen in the world and magic may as well be real. This is easily done throught coverage by the social (and the traditional) media.
- Support from the scientific community. Funnily enough, you need some kind of authority to step up and say "allright, we don't understand how those people can shoot fireballs out of their eyes; we may have missed something."
- Persistent and undeniable effort to make things clear to the public. It is unclear how the governments would react at the notion that a small group of individuals is capable of doing the impossible. Either to preserve stability and avoid chaos in the population, or for darker plans, the higher-up of every nation could try to cover up "magical incidents". I noticed just now that you actually want mass hysteria to be generated, but still the point holds. Your mages have to be recognized as mages, and not perceived, lets say, as terrorist bombers.
- Mages must agree: of course if your magical society has been secret until 2010, there must be good reasons. You need the majority of your mages favorable to going out in the open; if that's not the case, mages against can work against the revelation.
The best thing you can play around with is teleportation. One teleportation mage could carry the news in the whole globe, interrupting live transmissions as they are being streamed. He should be clearly recognizable, maybe carrying some symbol (let's say a red "x" on his shirt for convenience).
Better still is if you can provide the wide public with a tight timeline of his apparitions: let's say your magic society is on social media or on a media with some audience.
Their spokesman could just say: "One of our magicians is going to teleport in all the countries, live. Here's a list of the scheduled times of his apparitions". Following the list, people could see the same person materializing in and out of thin-air - that's pretty difficult to explain. The only con is that teleportation magic in your world must be convenient enough for this to work (e.g.: it doesn't take hours for a single jump, but mere seconds or minutes).
Other good spells could be levitation, telekinesis or gravity-bending, shielding of one person or area (imagine seeing something survive being shot in the face without harm) and so on. The only one you mentioned that doesn't play well is mind reading, since it's rather difficult to prove.