Links can be shared, but generally it's better to be part of ongoing discussions first. Once you get to know the community, if you have a relevant link to share, you'll have learned how to share it, just from your experiences as a member of the crew.
If you just want to share a link to a trailer for an upcoming game, or to promote a specific company, probably hold off and focus on the stuff above.
Hey folks, In an effort to combat spam on these forums, we've implemented some restrictions on new accounts that some of you may run into. While not being able to use every feature can be frustrating for new users, having a forum filled with spam is even worse, so we're doing our best to ride...
Read a few threads to get a feel for what's acceptable, if you're still unclear, read this: