You are infringing.
Here's an example of Non-Infringing similar names:
http://www.google.com
http://www.googleit.com
Go Ogle It.
Different.
LinkedIn is the ™
Your name is using the mark. Unless you did something like:
XXXLINK EDucational INformation and use the mark XXXLINK ED-IN
I would just change your name. Much easier than a court battle.