It is spamming I think. Taking advantage of a forum which gets a lot of traffic and basically using it only for their own advantage. Kinda hard to combat against this kind of misuse and it only really annoys the regular forum users. Although, if it gets out of hand and drives enough people off, I suppose it could hurt the site as well.
There's another forum I go to now and then and they have a glamor/nude section (don't ask me where, use google if you're interested) and some threads in there have like ten thousand views. If you're on the beginners section creating pointless threads (ones that basically only advertise for your blog) with 'spicy' titles like "budior pictures" or "my hot cousin" you are probably misusing the forum.
Not expecting anyone to change their behavior but you know what they say, 'this is why we can't have nice things.'