11.Never submit old news
Submitting old news will not help you in becoming a respected user. Yesterday's news is history. But if you still need to submit old stuff, consider feature articles, howtos and similar pieces that are up-to-date for a long time.

12.Check your facts
You must be flattered that users read your postings but you will hardly be flattered when users prove that you haven't got the facts right. In addition to sarcastic comments, you might also receive negative votes for your story, so if you want to avoid this, check you facts - or your readers will do it.

13.Check you spelling
Some sites do not allow to edit your posts later, so if you misspell the title, the URL, or a keyword, it will stay this way forever.

14.Not all topics do well
But sometimes even great content and submitting to the right category do not push you to the top. One possible reason could be that your stories are about unpopular topics. Many sites have topics that their users love and topics that don't sell that well. For instance, Apple sells well on Digg and The War in Iraq on Netscape. Negative stories - about George Bush, Microsoft, evil multinational companies, corruption and crime also have a chance to make it to the front page. You can't know these things in advance but some research on how many stories tagged with keywords like yours have made the front page in the last year or so can give you a clue.

15Have Related Articles / Popular Articles
Traffic gurus joke that traffic from social bookmarking sites is like an invasion – the crowds pour in and in a day or two they are gone. Unfortunately this is true – after your listing rolls from the front page (provided that you reached the front page), the drop in traffic is considerable. Besides, many users come just following the link to your article, have a look at it and then they are gone. One of the ways to keep them longer on your site is to have links to Related Articles / Popular Articles or something similar that can draw their attention to other stuff on the site and make them read more than one article.

16.RSS feeds, newsletter subscriptions, affiliate marketing
RSS feeds, newsletter subscriptions, affiliate marketing are all areas in which the traffic from social bookmarking sites can help you a lot. Many people who come to your site and like it, will subscribe to RSS feeds and/or your newsletter. So, you need to put these in visible places and then you will be astonished at the number of new subscriptions you got on the day when you were on the front page of a major social bookmarking site.

17.Do not use automated submitters
After some time of active social bookmarking, you will discover that you are spending hours on end posting links. Yes, this is a lot of time and using automated submitters might look like the solution but it isn't. Automated submitters often have malware in them or are used for stealing passwords, so unless you don't care about the fate of your profile and don't mind being banned, automated submitters are not the way to go.

18.Respond to comments on your stories
Social bookmarking sites are not a newsgroup but interesting articles can trigger a pretty heated discussion with hundreds of comments. If your article gets comments, you must be proud. Always respond to commends on your stories and even better – post comments on other stories you find interesting. This is a way to make friends and to create a top-profile.

19.Prepare your server for the expected traffic
This is hardly a point of minor importance but we take for granted that you are hosting your site on a reliable server that does not crash twice a day. But have in mind that your presence on the front page of a major social bookmarking site can drive you a lot traffic, which can cause your server to crash – literally!
I remember one of the times I was on the front page on Digg, I kept restarting Apache on my dedicated server because it was unable to cope with the massive traffic. I have many tools on my site and when the visitors tried them, this loaded the server additionally.
Well, for an articles site getting so much traffic is not so devastating but if you are hosting on a so-so server, you'd better migrate your site to a machine that can handle a lot of simultaneous hits. Also, check if your monthly traffic allowance is enough to handle 200-500,000 or even more visitors. It is very amateurish to attract a lot of visitors and not be able to serve them because your server crashed or you have exceeded your bandwidth!

20.The snowball effect
But despite the differences in the likes of the different social bookmarking communities, there are striking similarities. You will soon discover that if a post is popular on one of the major sites, this usually drives it up on the other big and smaller sites. Usually it is Digg posts that become popular on StumbleUpon and Reddit but there are many other examples. To use this fact to your best advantage, you may want to concentrate your efforts on getting to the front page of the major players only and bet on the snowball effect to drive you to the top on other sites.
An additional benefit of the snowball effect is that if your posting is interesting and people start blogging about it, you can get tons of backlinks from their blogs. This happened to me and the result was that my PR jumped to 6 on the next update.