What is a social media campaign? It's a campaign for social media for example is twitter and facebook. If there is a new project that's going to open and ofcourse all they gonna do is to promote their project thru facebook and twitter to increase their exposure. Uhm it's like you're going to adverise their project to your facebook or twitter account.
Can newbie join? It depends on the rules of the project some project accepts only jr. Member and above but there are some that they just accepting people with 500followers and above regardless the rank in bitointalk forum. You can read all the rules and regulations including how you will apply and the payments at the first page of the projects thread. I hope this will going to help you and also welcome to the forum
what is the best way to have 5000 twitter followers as soon as possible?all must be genuine followers
I believe the various bounty campaign has a tier depending on how many followers you have on twitters and i don't think there is a quick and dirty way of getting the number. You have to be active on twitter and having an interesting topic or area that you are focusing on.