If your site gets stumbled, you might receive a lot of new visitors and this is really why StumbleUpon is such an interesting community. There are many other reasons as well for using StumbleUpon, but today I am only going to focus on the marketing part of it (that is marketing your own site using StumbleUpon).
To be brief; many people, like myself, are submitting their own posts to StumbleUpon in order for other people to see them and “vote” on them. If enough people enjoys the posts, a lot of people using StumbleUpon will see them (and a lot of people are using StumbleUpon).
But there is a minor problem; if you stumble your own site too many times, it will be considered as spam and you will not be able to stumble it anymore. Other people can still do it, but you can`t yourself. I am not sure how many times you can actually stumble your own site, but I am one of those people who just can`t do it myself anymore (and I haven`t done it that many times).
I thought about something that might not be allowed, but it`s an interesting thought and a marketing trick. I haven`t tried it myself, but here`s my thoughts on what you can do if you are experiencing the same problem with stumbling your own site as I am:
Create two or more accounts at StumbleUpon, use different accounts when you stumble your own site(s). When one account receives the spam notification (well, not actually a notification, but a blank page when you try to stumble it), just switch to another account and use that one to stumble it.
Again, I am not sure if this is allowed and I am not sure if it works… but it sure is interesting.