Trademark Status of domains

I own couple of domains and I want to know my legal standing.
pfreelancer.com
yobtube.com

For pfreelancer.com, I have set up a gigs related freelance marketplace which is different from freelancer.com business structure.
Regarding YOBTUBE.COM, I intend to use it as a youth only social connectivity platform instead of videos only platform like youtube.com

Any chance they could sue me?