ISSUE SUMMARY: When adding youtube video the description text is truncated to 157 charaters. Vimeo descriptions are fine. Also tested on demo.jomsocial.com with same results.

For example adding www.youtube.com/watch?v=hi9JooUaJXg the description is:
Watch Aaron take on some Mexican cave drops: win.gs/1znzZgd See through the goggles of freeride MTB master, Aaron Chase, as he heads to an abandoned N...

It should be:
Watch Aaron take on some Mexican cave drops: win.gs/1znzZgd
See through the goggles of freeride MTB master, Aaron Chase, as he heads to an abandoned New Jersey mine for some deep-cave downhilling.
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STEPS TO REPLICATE:
1. Add youtube video
RESULT: Description text is truncated to 157 charaters
EXPECTED RESULT: Full description text.
BROWSER: IE, Firefox, Chrome

Hi Jason,

that description took from meta tag description. the youtube it self truncated it.
you can "view page source" at your browser. and you will find this:

<meta name="description" content="Watch Aaron take on some Mexican cave drops: http://win.gs/1znzZgd See through the goggles of freeride MTB master, Aaron Chase, as he heads to an abandoned N...">