Anyone know of any sky watcher group sites

I'm hoping someone can help me. I'm looking to see if anyone knows of any sky watcher groups or group websites. I'm talking about groups of people who go out and watch the skies for planes and/or ufos. I'm might be off on the name of this activity, but let me know if anyone has any info for me. Thanks.

Checked the web and there are sites you may wish to check-out.
Sky-watching groups are more popular than I would have thought after taking a peak at the web.

Dallas