Hey Marcomail,
Could you be more precise?
I know that in some cases, when you submit your string to Ping.fm, which then submits it to your social networks, if the string is incompatible, the social network might ignore it. For example, if your string is longer than 140 characters, Twitter will simply truncate it, add some … and post the beginning of it. However, some social networks will simply ignore it.
However if you can give me more information? Maybe what network didn’t work? And what was the string?\
Thank you!