As the rules and Vulkar's reply in the other thread point out: if you want to share links to such things; do so in your signature.
If you want my take on how to approach it (and bare in mind this is just my opinion, other mods may take a different view)...
If you really feel the need to start a thread about something you've made or found, first make sure it has some sort of discussion value ~ that's what the forum is for, discussion. A simple statement offing something does not cut it -- no matter how useful you think the item is. If you start talking about "flash-cards" and find that people are interested, then (and only then) should you consider posting links or pointing people to your signature.
Second, pay attention to where you are posting it ... flash-card wallpaper has no direct relation to anime, does it? General Chat -- yes. General Anime -- no. If that was a mistake, just say so... we all make them.
All this might seem a little restrictive or "anal" to use a common vulgarism; but we find it works and helps draw the line between what is and is not spam. By requiring that you start a thread that builds interest and discussion on the topic in question, we weed out those who only join the forum to post links and spam our members.
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