How to say the following in English?

1. Posting a lot of messages in forums, especially unmeaningful ones?

2. Only browsing posts and threads without replying.

3. Posting very long message(s) so that the whole page is his/her message?

I guess you have similar expressions in English. What I need is three words to describe the above actions, one for each.

Thanks in advance.
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Comments  (Page 3) 
Marius Hancu>Question Two: Some threads are even better than the above-mentioned, so they always remain on >top of other threads. Of course this status is also granted by the moderator(s).

A sticky thread, a sticky ....
Thanks. So a moderator or administrator can stick or unstick a thread.

As for the first question, I guess it might be "popular thread" or something.