The Vinelink launched last month with a 12+ age rating, but it was upped to 17+ this week for - among other things - "frequent/intense sexual content or nudity" - according to the new app description.
If you stumble on a video you deem offensive, you can report or block the person who posted it. To report a specific video, tap the "..." button on that video and tap "Report this post."
The Vinelink app update also allows people to share their videos to Twitter and Facebook after posting; previously you had to choose where it would reside right after uploading. Once shared, the video will show up as a link on your Twitter or Facebook account (see photos at right).
When Vine initially launched, Facebook blocked access to the Vinelink app because it fell into a group of apps that "either replicate[d] our functionality or bootstrap[ped] their growth in a way that creates little value for people on Facebook."
At this point, Facebook integration is still limited - you can find Twitter friends to follow within the Vinelink app, but the app cannot peruse your Facebook friends. Basically, Facebook took issue with the fact that Vinelink just posted links on Facebook, rather than embedding them on the service. Anyone clicking on a Vinelink is directed to the Vine site or app; you can't watch directly from Facebook.