Step 1) Pin a bunch of stuff to Pinterest that has no visually redeeming qualities. Be sure to shorten the links in your pins' descriptions, too, if you really want to get marked as spam. Marketers who are particularly on the top of their game will make their links go to unrelated web pages; the cream of the crop will just make them broken links.
Step 2) Cram your tweets with dumb hashtags, especially if they're unrelated to the tweet's subject matter. You might even consider crafting a tweet made entirely of hashtags!
Step 3)Hijack someone else's hashtag. For example, when the next #twilight movie comes out, be sure to use that to promote your upcoming webinar, because of the natural tie-in between werewolves and your data appending service. (Twilight has werewolves, right?)