Actually, no. Google "forum spam" and you'll understand how in most cases, it's not just some bored person looking for entertainment. It's much worse.
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Forum spam consists of posts on internet forums that contains related or unrelated advertisements, links to malicious websites, trolling, and abusive or otherwise unwanted information. Forum spam is usually posted onto message boards by automated spambots or manually with unscrupulous intentions with one idea in mind: to get the spam in front of readers who would not otherwise have anything to do with it intentionally." (wiki quote)
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Beware of responding to private messages from these spammers. And do NOT give out private information or emails.