[Plugin: Simple Facebook Connect] og:description change size

You can use the sfc_excerpt_length filter to reduce the number of characters it tries to send. It’s set to 1000 (the max) because this increases the visibility of the post on Facebook.

It’s a filter, not a function. Put code like this into your own plugin or site to modify the value.

add_filter('sfc_excerpt_length','example_length');
function example_length($len) {
  return 500;
}