"Postering is an extremely effective tactic if your trying to create a buzz - good postering can give the impression that there is a large movement already underway. When people think there is already a large movement in progress they are more likely to exhibit interest or attempt to join."
yea, but what happens when they realize there is nothing to join? you have to also create groups with your friends. you can't do one thing and ignore another, you have to do the whole lot of things. anarchism is an ideology which is made of many interwoven ideas. one or two of these ideas might not be too effective (although they normally have positive effects).
i saw this vid of an argentine guy (only an argentine would do this) who was going arround with a huge sign on him (on his back and front) which said "wake up imbecile", and with smaller letters it said something like "what if only 10% of the money in the world is real?". then there was people running arround and putting stickies which said that all over the place, including on other people's clothes. everyone was looking and reading the stickies.
this technique really get's people's attention. but you have to do it along with posters in places, pamphlets, and forming small anarchist groups. groups are important to organize and to get the people inetersted to start participating. if you can get an anarchist group to manage an extracurricular activity in the school, you will get a ton of atention. it could be a music group or any art group. you could even make a study group or a group to teach people about a certain subject (in an anarchist manner). what's even better is if that group is the kind of group in which the practice of anarchism would really show, for example, a class.
and dont forget to do things yourself instead of buying them. that also gets attention. it is something which gets people in because it involves lifestyle. if people realize that there is an anarchist lifestyle, they might be inetersted, even if they dont think anarchism can work.
but dont get too cought up with this and forget occupying, protesting, and getting rid of the state. these are important things, although they should be done only when the moment is right. if people get to cought up in the little things, they'll forget to do what's important, and we will just become another subculture controlled by the media and corporations.