It was such fun looking for kernel updates and holding off for dear life... Otherwise your system booted up to a command line prompt. Fine fine. I guess X will just continue to spiral plurally together as one big xmass.
When X.com eventually gets around to making its own window system, they may be in legal trouble. Perhaps the resulting lawsuit can raise enough money to get X.org development going again.
It is very unlikely there is customer confusion over the matter. Though both companies are in tech, they are in wildly different branches of tech. I don't think X.org has a valid trademark complaint in this case.
The letter x on it's own is not a trademark AFAIK. The distinct style of letter X is what would be the trademark. Because X.com and X.org are two completely different orgs with different brand identities there wouldn't be a problem.
You absolutely can, but trademarks need to be domain-specific. And the social media platform and the window system don't have much overlap in their respective domains.
Another window system couldn't come along and call itself "X", but a microwave manufacturer very well might be able to.
Oops, I guess all my math problems infringe a trademark. There are simply way too many things named X. Also, the X.org foundation don't have as much money as Twitter, which makes any fight a lost cause.