You can use other segments to include or exclude contacts from a new segment.
You might want to exclude any contacts that are already in another segment. Or, you may want to include all contacts from a specific segment. However, you may end up with an endless loop error.
Creating an endless loop
When encountering this error inside of your segment, here's probably the reason why:
You've selected two (or more) segments that are set to include contacts from each other. This means:
- Segment A will import contacts from Segment B.
- Those contacts are added into Segment A.
- Segment B will then start the import from Segment A, which brings you back to Segment A starting it's import again.
Congratulations, you almost created an endless loop.
The solution might vary, depending on what you are trying to achieve. If you want your new segment to include the same contacts as another segment, the best solution may be just to use the same filters for both segments. Remember that segments are dynamically updated, so the same contacts will be in both segments if they use the same criteria.