Here are additional 3 advices for you guys.

Don’t be greedy

The old saying that “the more you want something, the more it eludes you” is true!

Don’t waste others’ time – tweeting too much in too short a time means you are posting bad content whitch means people who follow you need more time to get trough the clutter (their streams). Consequently they’ll stop listening and following you.

Following too many people in hopes that some will follow back and build your follower numbers is bad too. People will spot you sooner or later so don’t even bother with that. Progress slow and with confidence.

Add images and/or video to your content

Did you noticed that all viral content is done with multimedia – images and video. And it’s easy. Find images on Flickr.com, Google Image Search (or some other service) and add them to your content. The same goes with videos (services are youtube.com, vimeo.com etc.). I’d suggest Zemanta.com whitch can do these things for you and save you some time.

Try niche social media sites

Don’t just focus on the big general subject sites like Digg and StumbleUpon! There is a lot of opportunity in niche social media sites and some local ones if you are a local business.

Here’s a great list of these type of sites. These sites won’t send as much as traffic as the big general subject sites, but the quality of their traffic is often much higher. You’ll get a higher percentage of repeat visitors, a lower bounce rate, and more time spent on your site because of the more targeted traffic.

Also, it’s easier to network with the power users because of the smaller user base.

Related articles on other sites

• StumbleUpon Gets More Specific (bits.blogs.nytimes.com)
• 4 Ways to Increase Your Traffic With StumbleUpon (kissmetrics.com)