I think this can depend on a few things. The license terms under which UGC is uploaded, how UGC is (re-)distributed, (for example retweet vs a capture vs a DL.) and context (part of a news item, or commercial endeavor).
However, I think parents especially overshare things about their children. Once you let something out of the bag, it's going to be hard to put it back.
And, of course, if you're using something for commercial purpose, you need to seek permission, if you're unsure about the license. However, much of the public's loosey goosey attitude toward copyright can filter into the attitudes of unsophisticated marketing organizations (an intern etc. not familiar with IP thinks they are doing "guerilla" mkting, for example).
> (an intern etc. not familiar with IP thinks they are doing "guerilla" mkting, for example).
Try: senior marketer perfectly familiar with IP decides to ignore it thinking they're doing "guerilla" marketing, and then blaming it on an intern if caught. Sleazy industry, sleazy standard practices.
However, I think parents especially overshare things about their children. Once you let something out of the bag, it's going to be hard to put it back.
And, of course, if you're using something for commercial purpose, you need to seek permission, if you're unsure about the license. However, much of the public's loosey goosey attitude toward copyright can filter into the attitudes of unsophisticated marketing organizations (an intern etc. not familiar with IP thinks they are doing "guerilla" mkting, for example).