I would be very surprised if any of these things will help you at all. None of them provide things that people really want. More importantly, attempting them distracts you from figuring out how to find out and make what your customers really want.
For example, you can try to spam to your heart's content, but people have this thing called a back button. Even if you can get a few people to bite, they'll most likely ignore you once they figure out that there's nothing there.
You can try to say "235 users online" when there aren't any, but that won't actually give users the experience they want. It might fool them for a little while, but that won't matter anyway if there's no reason for them to stay.
the point with the "235 users online" would be to get the user to signup...then once they are signed up and in your database, you can a) tout that you have X users...which will get your coverage + more users b) can eventually email them back telling them that the site was massively improved.
For example, you can try to spam to your heart's content, but people have this thing called a back button. Even if you can get a few people to bite, they'll most likely ignore you once they figure out that there's nothing there.
You can try to say "235 users online" when there aren't any, but that won't actually give users the experience they want. It might fool them for a little while, but that won't matter anyway if there's no reason for them to stay.